Very cool sig. I like it. Could use a tad bit more in the left space but otherwise I say it's a pretty awesome B&W.
I am not in the mood for for giving a long lecture, so I'll be short. Lightsource needs to be upped, tag is too sharp, it needs toning down and the right side needs blurring. It needs a stable shape in the background, I suggest adding 2 "+" different size and color (1 light gray, other dark) in the left near the stocks shoulder or add a vertical and diagonal line of the same color wherever you see fit. Also this is the best tag I have seen on this site, but then again I just joined recently. Nice job.