anything to get the vibe that he's got that mucoprotein coating (aka fish slime) on him would help alot too, but getting some warmth in the highlights will definitely help too. You're almost there man!
Hmm, fish slime, that's a really cool idea. I wonder how I could do it? Oh maybe bake out a material from zbrush that's shiney? What do you think for a warm highlight color? Yellow?