Pros: Looks great man, I like it ;). The quality and the sharpness are both really good, looks crisp smooth and clean. The render is awesome and flawless, and it looks kinda hard to render a pic like that. Nice color choice on the boarder, blends good with the rest of the spray. Nice spray.
Cons: The only con I can name is that the boarder has no design, it's simple.
Improvements: You can use some brushes when making sprays, grundge and scratch can match almost everything, when you'll use some brushes it will add a better depth to the spray, and make it less boooring.
Notes: it's a cool spray, try my improvements, and it will be cooler.
Pros: I like the box style for sigs. The colors and blend seem to flow very well.
Improvements: There seems to a spot aboce the knee in which you did not fully erase what you did?
Notes: Make simca!