Great metropolis you have here pal. Love the architecture. :) Personally i would add a little color to it. It would definitely add to the scene. For example, a faint blue lightsource from left/behind the cam and another red, coming from the opposite right, and perhaps some ranged white lights coming from between the buildings to simulate some streetlife. You could probably add some traffic between the buildings, where its not so crowded, or a few larger ships above the city, but i think its alive as it is. Ok, just a few suggestions. :)

Rudolf Herczog
Digital Artist
www.rochr.com