Just one note, from what I see, the back of her hair could use a little more fullness. Even if it is not shown in the photo, it would help as the back of the head seems a bit flat.
I really like the sketchy quality, and light/shadow relationship is convincing. The only thing that jumps out at me is the ear: it gives the impression of being slightly misshapen. For me one of the most challenging things is to think about how I'm going to show something accurately and convincingly with just a few strokes--much harder than fussing over details.
Linear Mode
