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Well in the picture above I have highlighted a few stray bits of c4d? that should not be there imo. Get rid of those and that is a start.
Also the bottom left corner could do with darkening to compliment in with the lighting, this will add to depth of the sig, due to there not being much depth also blur the BG and sharpen the foreground to also achieve this.
Also the text kills it for me, maybe don't put any for this signature, but when making others do not put text in the corner as it kills the whole signature. The text should compliment the signature.
Apart from that overall a very good collab, can't wait to see more from you both.