I should've done digital but also wanted to practice more traditional medium, so here they are!

I noticed there are two types of people in the world: people with hobbIES, LOTS of hobbies, and people with no hobbies. I don't know anyone personally that only has one hobby. It's supposed to be fun! I drift around among different hobbies. Art has been my longest running hobby in my life, but I still do music whenever I can. Not as much as I'm "supposed to", but I'm not a professional musician so who cares. Sometimes I drift away to do something else for a few weeks or months and I don't do art much. Just follow what your heart desires. But it also sounds like the problem of making art too stressful for you, not so much that you're not interested in art anymore. Make sure you remember why you wanted to do art to begin with, and do some fun, personal projects in between assignments. Doing nothing but following courses can easily burn you out.

What's your goal? Draw figures well or learn anatomy? Do you want to learn anatomy well so you can draw from imagination and know which muscles will contract, which will extend, or just enough so you can draw believable figure drawing from observation? Hampton's course covers more geometric forms, which could be a good training for you if you have trouble visualize 3d forms. If you want to learn anatomy well, following Stan's free anatomy courses on YouTube and do all the assignments would be a good start, maybe consider investing in the premium course. The interactive tools really helps you see how the muscles move from all angles.

Yes. You need to be able to eyeball and measure. You can use your pencil to measure like he showed in one of his earlier videos. https://www.youtube.com/watch?v=tZtnKp4fAPk https://www.youtube.com/watch?v=1J7RQvKnWf4

Your style is pretty close, but your lighting direction can be more consistent. Like the bird on the right has no shadow at the bottom. And their shadows can be warmer, as in your example. You can make the lit areas a little lighter and yellower, and have a warmer, darker and more saturated shadow. The lighting on the brick wall is odd. if the light comes from the top, you should make the top lighter. And the brick wall is much more saturated than the animals. I don't know if that's intentional because the brick wall is the focal point? If not you should consider change the color/saturation of the wall.

Hmm I don’t remember that. And he just uses a pretty basic brush for anatomy tracing, and most of the lessons are done traditionally. Are you sure he wasn’t talking about downloading model pack, or ebooks?

Sorry you're feeling frustrated. What videos have you watched? Have you taken a course from the beginning to the end? Diving the head into 3 parts is just one of many, many steps to get an accurate portrait. You have to watch the relative sizes and positions to everything else, making plum lines, straight and horizontal, and any direction of lines between any two spots, like corner of the eye to the tip of the mouse. Everything has to line up in order to get an accurate portrait. If you haven't watched the portrait course from the beginning to the end, please do. It goes much further than dividing the head into 3.

I have a problem in mastering C-S-I Line drawing. I can't drawing any organic shapes using C-S-I line drawing and tapered strokes. Anyone can give me a help?

What kind of art are you interested in?

That's great!