Is that grunge brushing in the background?
If it's a c4d render i would try adjusting to a different color and maybe bring up the contrast on it.
Also, blend your render into the background a little bit more.
Try duplicating the render a couple times and using a gaussian or even motion blur if you prefer it and blend it into the background. Try to stay away from just overlapping the background onto the render.
Otherwise, very nice sig.