Pros: Nice stencil of Jason. It looks kinda creepy in-game and it's pretty original work, not many Jason stencils have been done before.
Cons: Well, the spray itself is totally jagged and not too smooth. There are gray parts all over the image, however, all these issues are very easily fixable, simply read on and I will explain how to fix this.
Improvements: When making a stencil, make it a stencil first and then resize, not the other way around. Because of the resize, the pixel amount will be minimized and the image will end up looking a lot smoother. If you don't think it's smooth enough, you can use a small black outer glow to help with that. As for the gray parts, simply add a black color overlay to the image, it's that easy.
Notes: Nice attempt at a stencil, but not the best of your works. Just take my suggestions into consideration for the future.