Wow, cool to see so many lines :D The lines... they are all connected!

The boxes convey the perspective and the shape of the car. Good job! The wheels seem to be attached in the wrong direction. I added arrows to indicate rotation of the wheels in reference photos and in your drawings. As for the ellipses: the top and bottom have some sharp corners. Rounding those out would help to create a more cylindrical shape.

Moon sink! Love it! Some tips for how to improve freehand drawing of boxes: 1) Before drawing a line make sure you know where the vanishing point is or roughly is. For example: "about half a pencil length up from the corner of my page" 2) Ghost the line before drawing it on the paper - hover pen on the paper and practise the stroke of the line from the start to the vanishing point 3) You can also mark the beginning and the end point of the line before drawing it. This way you split the task. One task being to decide where you want the line to be (marking the points) and second being the task of drawing a perfect line from point A to B. This also helps you understand if it is more difficult to decide where the line should be or if the drawing process is wobbly and you just place the lines incorrectly And finally practice. Draw freehand boxes on the paper and then check your work afterwards with a ruler. Using the ruler to extend each edge of the box to the vanishing point. You will then see which specific boxes, rotations or angles are most hard for you as their edges don't converge to the same spot. This is just something that has helped me a lot. These tips have stuck with me from the "Draw a box" lessons. https://drawabox.com/lesson/1/roughperspective It's tedious practise and the pacing of the lessons can cause burnout (I hate the 250 box challenge...), but I saw significant improvement in my understanding of perspective as well as improvement in free handing perspective. Bye ruler, won't be needing you again.

I think you are on the right path. The robot clearly looks like a robot with shoulder joints and everything! "my hands are just too dumb to do what my brain knows" This is such a perfect example of discovering something and starting to practise it. The brain has taken a step forward but your muscle memory has to catch up now. Your brain is now able to judge the outcome and give your self critique (which is useful). You just need to practise more! I think the cylinders look real if you view them individually. But they might look off if compared to the rest of the objects around it. So try NOT to rush through the initial box phase and make sure that the box aligns correctly with the other boxes around it. Use the ruler if you have to. In Procreate you can draw a line and leave your pen on the tablet and hold it still. After a few sec the line will become straight as if drawn by a ruler. You can try drawing something by first making sure that the boxes are correct. Mark specific vanishing points on your canvas and draw all the lines straight to the corresponding vanishing points. You can later erase them or create a new layer on top of it. You can soon start skipping some steps of this tedious process once you build up muscle memory.

I deleted my previous reply. I thought it was through the centre but now I rewatched the previous video. The major and minor axis don't seem to cross in the centre of the square plane. This is a very good question.

It’s tricky to evaluate these because the boxes are hard to make out. Try to take a picture where the paper is more evenly lighted as half of the page is in the shadow. Also the camera is at an angle to the page thus distorting the boxes, try to take the photo more directly of the page. It would also help if you number the boxes corresponding with the head number. The bottom right box is the only one I can make out clearly and it looks like an ok box.

Level 2 - rotated hand nr 2. I think I will try more with different view angles. This "along the palm" angle is great for figuring out how steep of an angle each finger joint box should be. BUT this angle sort of removes all the side planes. So this is a great view angle to study foreshortening by making a lot of the boxes use 2 point perspective (almost). Having less vanishing points makes you focus more on the few lines that are converging. So if each joint of one finger is rotated more than the previous joint then the angle of the converging lines will keep on getting steeper (or more parallel).

Brilliant! This is a mind blown moment for me.

I love these!

Good idea to overlay with photo later! Will try it out as well. Your boxes look correct to me. I am jealous of how you managed to capture the likeness of the models with so few lines. The only "mistake" that I can see is with #3. Largest plane of the box (which is representing the back of the head) in your drawing has its left edge along the ear. But I think that should be roughly middle of the side plane of the head. The back plane of the box should thus be a lot smaller.

The more I do these the more I seem to be slowing down(starting to measure a lot) in the box drawing phase. I can feel when the box has incorrect angle or proportions, but only after I put down the lines. So I need to draw a lot more of these boxes to develop the sense for it. As for the heads, I seem to struggle with the eye sockets. They need to be a "cavity" but some parts of them feel flat. Especially the edge between eye sockets and the cheekbones area. Not really part of this exercise, but something for me to dive into later.

Very cool side project! Your cube is rotating correctly around it's front left edge. So as the box rotates around that edge it will go behind it and get "squished" because its going farther away from us. What you have drawn is correct, but from your description I gather that you would like the cube to rotate around it's central axis (which is imaginary as no line on the drawing currently represents such central axis through the cube). That is more difficult to draw and even trickier to animate. Instead of starting your cube drawing from one of the edges and then extending other edges towards the vanishing points, you will now have to put down an imaginary vertical line (or some construction line to erase later) and start to draw the box around it. To be honest, I don't really know how to do construct boxes around central axis reliably. I have attached some steps for how I would try to do it, but it still involves guess work. So the size of the box will not remain constant throughout the rotation due to guessing errors. (not sure if images will attach in the correct order, but they have numbers on them)

This is only hinted at in the current videos, but likely will get covered in future videos. I will try to give an explanation anyway. Short answer is that you can't place an object outside it's vanishing points. The box shape gets so deformed that it breaks the 3D effect of your drawing. So for current exercises consider the vanishing points to be the edges that you can still draw objects on, but don't go past them. A bit of a longer hint for what's likely to come: Stan already showed an example of stacked books. These books got their own set of vanishing points because they were rotated compared to each other. Once we learn more about different objects having their own sets of vanishing points THEN you will be able to place an object outside of some vanishing points and "generate" new vanishing points for that specific object. What I mean by this is that currently we use two vanishing points for the entire drawing BUT in the future you will use vanishing points per object. Some objects will share vanishing points if they are aligned like a set of houses on a street. Some objects will have their own set of vanishing points because they are rotated compared to the houses like a car parked diagonally in front of the house. By that time you will likely think about your vanishing point placement for the entire scene AND decide if the next object you are about to draw will need its own set of vanishing points. This may sound like a lot of work to do for every object, but as Stan said: you will develop a feel for it and you can totally eyeball it OR you can go super mathematical if you want maximum precision for your technical illustration (likely would need perspective specific course for it)

I have highlighted a few lines that seem to not converge at some other vanishing point. But I believe you do get the idea of it as these few are most likely accidents from trying to guess the angle of the line based on the other lines near it.