Nice! I'm liking the color scheme you have going on there, the only crit I'd have is to maybe get some more contrast and material definition in your specular maps. The metal bits are looking kind of flat compared to the rest of the model, it may be a good idea to bump up the spec amounts. Atm, your spec is going from 50%…
I agree with shrew81. The biggest problem I see is a lack of material definition in the shader. The skin looks like it's the same material as the metal and the cloth. he biggest culprits are spec and gloss, but you might also want to mess with your diffuse. Metal (especially shiny metal) should have a dark diffuse and a…