First Picture: Over all it looks nice. First thing that caught my eye was the collar bone being in the neck, it was rather jarring. Another thing was the arms, I haven't a clue what's going on with them, I do get that it's just a head & torso shot but it looks like the arms are bending behind the person.
Second Picture: Uh it's a pretty common thing everyone and their mother can draw, but I'm a sucker for symbolic shit like that so I'll give it a pass. :v
Third Picture: It just feels off, I can't quite put my finger on it but I feel it deep in my soul.
You could sharpen your lines and shade them a little better but the last two are nice. The top one, were you instructed to use different styles? I like the body, hair, and top (especially) bc they are shaded differently but look really cool, the glasses seem a little out of place though.
The first thing that caught my eye was the shoulder strap that was hanging the way it was. I instantly understood what you were going for and the whole thing had a special vibe to it. I can't stop looking at the purple part of the hair that came out great.
I won't even bother with any critiques because your so good I bet you already see more than I do. I can't believe how good you are at so young!!
I really like the 2nd one. It makes me think of rippling water but what makes it interesting is that the drop continues through the ripple. Is it supposed to symbolize a portal? New beginnings perhaps? Or maybe the fact that life can take unexpected turns? That's how I interpret it anyway. Very interesting. It has a surprising amount of depth for something so simplistic.
Its alright The best aspect of your drawing, was the hair! it looks fantastic! I would try practicing drawing people, anatomically correct. Their are great books that teach you how to properly proportion the people you draw. It creates a great foundation for all your future art work! keep up the good work.