Sketching along with the lession

I'm returning to this lesson after a few months with a question about what exactly I'm getting wrong with the proportions. There seems to be something I fundamentally misunderstand, and it usually results in an elongation to the brow to nose area. This is a pretty rough sketch because I'm new to digital, and just wanted to check my work in photoshop and see if I could get a feel for where I'm going wrong. The first photo is just a side by side of a partial construction and the reference. The second photo has a photo shop grid, which helped me identify that the problem seems to be with how I'm identifying the brow line and keystone, but I'm still struggling to see why. My first thought is that I'm not actually cutting things into perfect thirds and halves, but the third picture shows that I'm pretty close. I created on line between each section, duplicated it, and lined it up with the others and they all seem pretty close. My only conclusion is that I might be making the browline too high. I feel like this is the biggest bottleneck to my improvement right now, even though I think I fundamentally grasp the process lined up in this head construction, my drawings look absurd due to these kind of mistakes, and I feel like I can't train my eye fast enough to identify what is actually wrong with them. Anyway, any advice would be really helpful!

You said cranial mass is a "sphere" or a circle, and the jaw is in proportion 1/3 - 2/3. But, quite often, it seems to me that you do not respect this proportio, often having less than 1/3, As in the first drawing you making in this video... Something I don't understand? Thanks for your feedback!

Notes from the lesson! Lots of great information to absorb here. I admit I was a little confused about some of the information presented in the Head Proportions Made Easy lesson, I had to watch that one a couple times to understand some of the concepts, but all of that information fell into place greatly while watching this lesson! Pardon for my messy handwriting!

I have a question! While looking at the relationship between the shapes of the features, I sometimes find myself having to cut off from the chin to compensate for making the jaw/shape of the head too long relative to the model in the beginning. During figure drawing I imagine this would cause problems for the overall proportions of the figure. How do I deal with this? Or is it strange that I am often making the jaw too long?

This one was super helpful to cement things further and I’m feeling more comfortable with the system! The top of the skull in perspective is my enemy 💀

These lessons are excellent! I would love to learn more about how to draw the underplanes and the neck, I have a hard time understanding that part.

Holy Smokes, Mr @Michael Hampton I am a bit ashamed to ask this question after all the lessons and exercises (which I have seen and done. I'm just missing the latest one) but I am still confused with the brow line, and the length and width of the jaw. I mean, is there like a "landmark" for the eyebrow position, like the center line of the sphere in the Loomis method? I understand the "glasses" metaphor for the angle, but I mean the initial placement. How high or low in the ball is the initial brow line? How do I know if I'm placing it correctly? In the exercises I was just guessing based on the reference. Regarding the length, you explained is 1/3 of the total space of the head in the front, but how about in the extreme poses? How do I know if I am shortening or lengthening my lines too much? Is there a point of reference, a landmark in the ball, or in those angles or something to measure? Same thing with jaw width. Do I just guess by eye? I hope you or anyone in the community can help me. Thank you so much in advance.

Thank you again for another great lesson! I'm a little confused about sunglasses versus the bean, how do they match each other? Is it the subject of the next video?