im gonna start with saying your depth is very good, and this has the beginnings of a fairly good sig, if you work on a few things first off, the lighting is way off.. if you have a dark signature, you might as well make the focal dark.. or the background light.. but at least one of the two. with a dark background and light foreground, you set up a signature that looks bad because there is some invisible light source. secondly, although the sig is dark, i can still see some attempt at flow in the signature. now the render/stock looks like it should have the flow in a diagonal up/right direction, but yours is going kind of horizontal-diagnal/down. it does run with the gun though so il give you that so the main thing i would suggest is making the signature lighter.. give it a seeable background and such