I think this needs a bit of an overhaul in terms of stock work mate. It's a bit cluttered and looks dirty, although that may have been the style you were going for.
This is honestly my favourite sig you've ever made. It could be changed up a bit to make it a great sig but I love what you have. One thing you should try is putting the stock over Mayo and having the lighting on Monta so pretty much flipping the stock.
It looks a bit washed out, and text I don't really like. Seems a bit too sharp to me and its all over the place, I somehow what like the style. Dope, but could be better.