I like it too dude. The colors are very vibrant and flow well with the render. The BG is awsome, I love the grunge feel of it. Nice blending. Brightness/Contrast is just right methinks. Good job on this one!
The blending is awkward, it almost looks like a floating head. Also the lighting is kinda off. Great background you have there thought and colors. =P
i edited with a v3 and i moved it to the left, couldnt move it any further without messing everything up
i like some of the effects it looks pretty cool but i find it slightly akward with the blurr mainly focused around the render
The sides look awkward against the black background. It's alright when against a white background. (Just some random thoughts lol.) Anyway, the background has pretty nice colours and textures. But I agree with boobsmagee about the blur.