I'm sorry, but I feel like being a critic on this... I have no clue why, I just wanna....
1.)Head - A bit to big. I think it should be thinner.
2.)Shoulders - Too small. Yes, the head is supposed to be pretty big on the small shoulders, but the shoulders are too small. Try making them a bit bigger.
3.)Hair - I'll cut you a bit of slack on the top part, but it's still a bit flat. As for bangs, it doesn't go out as far as you made them. Now for the bottom part of her hair, it looks unnatural. If you look, you can tell the back part (the part that's in the back) doesn't connect to the front part and hence, makes it look awkward.
These are the three main ones, but besides that I think you did well. So good job! I'm sure you'll improve!