I like the soft and rough coloring; in particular the bright and jagged highlights on her knees and the use of the pink in her dress both catch my eye.
Her hands are wonderful, and I'd say the heart of the drawing. The way she is holding the comb is very nice. (Although, I feel her arms might be a little short - I would check your proportions.)
The thing that I feel is most important to fix is her face. Her facial features are nice, but their placement is off. She has a 3/4 face, but her features are facing us.