the robots looks familiar, did you get the basic design from something? they look kinda like the geth from mass effect, but i suppose all humanoid robots are gonna look kinda alike. the details is pretty good considering most of the stuff is meant to be far away, the detail on the closest robot is very good as well. Don't really like the... light? thrusters? whatever those bright yellow/ white and orangey/red bits on that space ship are. They stand out a bit too much in contrast to the rest of the picture.
I like it but I would have liked to see a bit more action going on, even just a few more robots/ spaceships going around would be cool. Maybe some explosions in the background showing it ain't over yet. (whatever has happened) But I suppose it would have to be bigger for that... whatever. Good job.