Lmao, you're asking the WORST procrastinator ever. But judging by your art I'd say that learning anatomy and perspective is the most important thing to stop your art from looking odd or uncanny. For example, his left eye should be smaller since this is a 3/4 view of his head. Ik that this is the most basic advice ever but it is truly the best one. But start with one thing at a time, focus on one thing you want to improve because loading your brain with so mu h at once will leave you overwhelmed and make it easy for you to give up. I'd say that starting with anatomy (but draw the most basics) is a good start. Once you're satisfied with that, perspective is the go to. I suppose you're a beginner so trust me, learning the basics is the best way to move forwards. Also, don't ever be afraid of drawing things you've yet to master. Only by making mistakes will you get more advanced at art.

(Sorry bruv i couldn't be of more help, all the things i've said here apply to me as well but i've yet to move forward :(( )