Wether you are looking for stylization or a more realistic aproach, head construction is the subjet that can benefits you the most. Look for a course that focuses on that, portait drawing is more specific but head construction talks about the theory that concerns to every artform related to drawing the head. That can be a good place for you to start absorving theory.

Here are some nose studies I did. I would like some feedback on what i should improve on

I think they look great! I would say that some of the hands do look a a bit small. I bring this up because I got called out for this in my class for having this same issue and I’m still trying to work on it😅 one thing that I was told that might help was if you draw hands small, draw them bigger than what you usually intend to do if that makes sense

Hi there, I try to help you, but I don't speak English well. Just like this

This is the image I used. I know i could've used a ruler but I couldn't find mine so I tried using another paper to somewhat measure what they're supposed to be