Looking good. I noticed in your re-topo you may have an N-gon. An N-gon is a polygon with more than 4 vertices. They can cause problems at rendertime, especially during mesh deformations for animation.
I'd be interested in seeing some renders from Unity once you've ported it in there
*edit. Ba, noticed another N-gon straight after posting. It's on the cheek below the eye. Easiest way to get rid of them is by terminating your edge loops by making a traingle with a new by poly. 3d coat also notifies you of N-gons in the bottom bar with the other polycount information.