the render looks bad, you should erase the edges with a soft brush to make it look better and have it blend with the sig. Also, I kinda see two lights, on each side of the render. There should be one, 'cause it kinda distracts your sight of the focal, so yeah, only one lighting. That's all I think you should do. :/
accually it wasnt a render it was a stock and the lighting aint my fault it was the ****ing stock i used
The white fragments along the outline of the stock looks very beginner-ish. All your sigs rock, but they all look the same with different pictures. Great job! 7.5/10