I like it, how bout you?

Very cool.

Hmmm...C&C?

Perhaps creating some contrast with the left side and the firey focus of the sig will add some more depth to your sig. Also I dislike the little tiny explosion about 50 pixels from the top and 100 from the right side, by his shoulder. It's to shiny and distracting from the main object of focus.

Otherwise, really awesome.

^Haha I would've thought the other little explosion would be more distracting

Hmmm, it is definitely nice, but You need to sharpen the render a bit, he blends somewhat to well for the first couple of minutes. Otherwise its quite nice. And the explosions actually look decent.