finishing an old(er) character
polygon
So this guy has been "done" diffuse only for a while now. I decided to apply a proper spec map and light him correctly. Here's where it is at pre-spec map. Any advice on anything so far, or advice on making a good spec map is very much appreciated 
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I only noticed a few things on it that I'd fix. First, his bald head seems a little flat... maybe add some slight color variation or a couple veins or something to add interest. The other issues are mainly with his torso anatomy. It looks like you got the pecs right on the model but raised and changed them in the texture. Instead of having the bottom edge curve up in the middle, keep them flat like they are on your model. The other thing I noticed was a lack of hips.. it looks like his body just gets sucked down into his pants from his abs down. Just add a little definition on the sides of his torso about level with his bellybutton... that should do it. Wish I could help with your spec map but right now spec mapping is my weakest point too
Ferg: Thanks for the suggestions. I have addressed many of them as you can see, but I think the back of the head is still an issue. I will work on it. Meanwhile, here's an image of the spec map I made applied to the model. (sorry for the large image size)