I've never been a huge fan of the text in your signatures... Maybe it's time to try something other than changing the blending mode on the text layers.
The smudge on his right shoulder is a little to dramatic and the size of the signature is....different. Definitely a good quality signature, but there's some minor flaws here and there. The lighting may look a little to dramatic also.
8/10 Overall. Great sig, but then again not perfect =]