Id say blending looks good a nice effects, but yea; maybe dim down the smudging cause it does look like its brushed on and make a lightsource on the other side of him.

Text is really bad, would take away the stroke around it and dont bother with any blending options on text if thats what you did; use a lighter color from the render or sig itself and maybe if it sticks out too much lower the opacity on it.

Border is ok, maybe tone it down by 1px or so, just so its not taking up a good portion of the sig itself.

Other than that nice work man, good style.