First, superb modeling.
I may be that the chin is to low, or that the mouth is to high, it looks a bit "strange", or is it just me. Maybe try to lower the mouth a bit to get a more female touch.
It's a bit difficult to see the mesh, but it looks a bit heavy (is it triangulated yet?). I think you could do without extra poly on the mouth/lips, rather have a tex-map on that.
Anyway you can smooth the hard edges in milkshape?
What's the polycount?
let's see some more shots from different angles, and a triangulated wire...
- Kjetil