well done so far, i like the shape of the model and details, the lighting is a bit 'flat'. what renderer are you using, i would personally use mental ray with final gather and GI (if you don't know how it works see the tutorial on it). The textures look ok, but are they procedural or real textures, they look a bit repetitive.
Another thing you could do to enchance those details is rendering a Ambient Oclussion pass, it adds shadow to the model in crevices and around other details so it will look nicer. What sort of look are you going for, we could help with the shaders if you tells us a bit more about that and the setup you have now.