Spec map we can use one of those Ambient CG textures and will look fine, in-game. I was meaning to replace the "generic" spec textures with new ones anyway. For the gold hair, I think the diffuse needs to be darker, similar to this (without the highlights):
Spec maps can have color, so the spec map in the hair area can be yellow, while the rest of the body is gray. So, you get a yellow shininess on a rich brownish diffuse (the hair), for a faux metal look, and the rest is just a normal light white highlight as if painted.