Hey man, one thing you might want to think about is this:
Instead of just adding "texture" for the sake of adding textures....try to come up with reasons for the textures. Ie....if he's green...why is that? Is it paint? Is it the hue of the metal he's made of? Is it some foreign substance/material? Is the paint chipping? Does he have battle scars/scratches?
Etc etc....right now your textures are really unfocused and don't seem to have a rhyme or reason....they're just "there".....so try to give them all a reason and a story
That being said...the "metallic" shader you have on them at the moment does have a nice sheen to it