The middle of his forehead seems too deep to me.
I think you could transition the top of the head a little bit more gradually to the bottom. I'd move the chin down a bit too if it didn't screw the quality up too much.
i wouldnt expect less from you jc this is amazing get msn or something of the like i want to annoy you i would really appreciate it if you taught me a thing or two about texturing (and zbrush stuff) also i could try to get you into vibe if you want :L