Wow, great model, especially since it's all NURBS! I can't even imagine doing an organic piece like this using NURBS, they kinda freak me out 
I think it looks great even though it's just basic shaders, but yeah, some dirtied and messed up colormaps would probably add to the feel of it
Liter is French for 'Gimme some ****ing cola before I break vous ****ing lips!"