No offense, but i think that trying to put alot of 3d detail on a 2d (ish) sphere texture is going to look like hell. You might want to change your request to A robotic head with eyes under a visor.
Sorry for being rude. I was entitled to a bump, so I bumped. It's possible. I've seen much more intricate.
I like that visor... but I don't even see a face O_o