Myself, I like this one. I do think you did overblend (or smudge) the render in some areas like the right side of his helmet. Also there is a part of the hand that you missed and I feel like you overdid that as well. You also smudged out his entire right shoulder.
For the hand... Next time just make new render layer and gauss blur (dont go over 4) andjust erase what you don't want blurred. Takes some time but will work better for what you were trying to achieve.
The text... if you're going to put it in the corner or off to the side it needs to be much more subtle so that it does not draw so much attention away from what people should be looking at.
This is a pretty cool sig I think... over-used render or not... <- that's retarded by the way. You just messed up on some parts, you had good ideas tho.
b&w is better by a mile btw