Pretty nice! I don't really do 3D so I can't help you too much with the more technical aspect, but there's a small thing that I'd change. I would smooth the part between her eyebrows. Right now, because of the two bumps, it looks like she's frowning. So unless that was your intention removing them would give her a more relaxed appearence.
The ear also bothers me a little, but that may just be part of the low-poly style. Other than that, good job!