I'm thinking the ship could use some windows (which you can texture on by the way) it can also use some lights, and probably some antenae for "communications" maybe small satelite dishes as well?
I know you have test shaders one right now, so I dunno if I'd say much about those at the moment, but you do need to scale the bump mapping down quite a bit, the size of your bumps right now make it feel almost like lego block size, and i'm assuming the ships are HUGE.
I think a scene of them in grassy fields would be awesome! the contrast of nice green grass on the white ships would look quite cool!
Keep it up, I'm excited to see more
