Nailed it! Looks great without the textures. The lighting sets mood, his pose / proportions give him a lot of personality. Pretty strong posing skills dude. Now, you can make another pass at it (next round on this guy, or the next robot) -- no texture yet, but add more detail - some nurnies, nuts and bolts.... Inlays/bevels.

First level = Overall Shape (If you're talking about humans - it'd be the shape / pose of a person) and basic planes for light, etc...
Second level of detail = eyes, teeth, refine it....
Third Level of detail = Pores, freckles.

You should get the idea for what you've got on the first pass.... definitely see it as a piece on the second pass (that's what I'd say you've got here) -- the 3rd level of detail just adds more realism.

This dude is awesome, I really like him. Congratulations on coming so far so fast.