I agree with some of the other comments about the 2d being a little out of place, but it still looks pretty good. I don't personally really like that mechanical/engine model there off to the upper left of the middle.
I really do like however the colors and the sense of negative space.
The colors are great, the red-orange with black is striking, and the accents of lime green really make the colors very nice. The reflections on the 3D are prettycool, but what I'm really amazed with is the Photoshop work at the top, its just superb. Good job, +fav!