Pretty happy with the way this turned out. I took a different approach with this, rendering several images (Base Diffuse, Specular, Occlusion, etc.) and did all the compositing in GIMP. Also used Sculptris to paint the bump map.
Higher Quality:
http://ghostbungle.com/wp-content/uploads/2012/12/Head_Composite-Final.png
Portfolio:
http://ghostbungle.com/wayne-baker/
