My only critique would be to define exactly how she has her head held. just looking at the lower half of the face, it seems as though she's facing down, looking up. but when you look at the eyes, they appear as though she's looking and facing forward. So maybe adjust the browline a bit? That and the shading on the left eye is either rushed or you just haven't mastered it yet.
But that aside, I think it looks wonderful! Keep up the good work, I really love the piece.