Very nice. I think she has a very nice facial expression. the shading of the skin is nice as well as the shading of the clothes. I very much like the way you drew her hair, it has a nice look to it and the way it flows works well.
Hahaa most people leave the facial expressions blank. They focus mainly on the body structure and decor of the drawing "attire, background, etc" without really delivery a tone/mood to help accent the emotion in the drawing.
Luckily, you have done all of that with this hahaa