i disagree, i think the emptiness of the right side compliments the details of the robot on the left. the color is awesome as well. I think it looks the best out of the ones you have shown here. kick ass work man.
EDIT: oh crap, i just saw the Samus one. Now i think that one is the best, it looks so good, but the robotics is close behind!
Your the greatest on this forum dude. I only keep this sig for three reasons. I love it, it was made by Deni, and it's awsome. If I ever need a new one, your gonna be the first I go to.
Then it is poorly placed imo. I cant figure out how you manage to photoshop that amazing backgrounds but not able to fit an image and some text in it properly.