Ohay, the nerd is about to come out of me, but this reminds me of Power Rangers Time Force where its set in the year 3001. But that's the nerd in me. The artist in me said this is highly detailed and it looks amazing.
Quite the detailed picture you have here. I do have one critque: the roof of the building with the gold dome is very crooked and out-of-perspective. However, the walls of the building don't look too sturdy, so I guess it could be excused as sagging from age or something.
Wow. Very convincing portrayal of a futuristic city. You manage to give it that sci-fi look while still maintaining a distinctly human feel. It's probably because of the diverse look of the buildings you've drawn. Well done.