As I see many people pointing out your proportions in your figures are off here and there but that's something that you'll improve with with repetition. What I want to see is some personality in those figures. What does their pose tell us about their personality, how about their expression? I know it's just like "well they're a model and they're standing in front of me naked". But do they look tired? Worn out? Are they sleeping? Are they fidgeting? Are they day dreaming? Are they trying to seduce one of your fellow classmates (lol)?
You're working hard to improve and that's wonderful to see. No doubt you'll get better through time. Just remember to have fun with stuff. Stay creative. ;D