Adam: Really sweet work man. I'm glad to see izmojuki stuff in 3d too. :) Kendo: Badass design. But EQ is right; Marmoset hates light diffuse textures.
Mefix: If you can't add Ambient Occlusion to your diffuse, you should at least add some vertex-lighting. It would make the whole thing look a lot better
ArtsyFartsy, i like, but it looks like it could do with some better diffuse work, and an ao map. High poly looks good, now just get it to work in your low.
Keeping my unsuccessfull journey in the pursuit of work... here is another head i began yesterday, female this time. First baking done, will now fix a couple errors and paint diffuse.
the low poly might have enough detail, but you should make a high poly and use a reference if you didnt to get a normal map, or if not allowed, get a really good diffuse.
Working on the texture for an old model I did some time ago. Not 100% done but getting close I think. I went for diffuse only. Max viewport 100% self illuminated.
Rick: I think you need micro details in your normal. Try taking your diffuse texture details and running them through crazybump and then, delicately, adding that to your existing normal.