Pros: The quality and cut out make this look very realistic and the idea itself is great. I bet this spray will catch my attention and might fool some people.
Cons: Well, I agree with the others, it should be smaller for better realism and you should use a shadow here for 2 reasons. Why, it would look more realistic and 3D, and the other is that the blades blend with the background too well and are harder to see.
Improvements: Make a pack, one big and the other small, so people can choose which one they want to use. Then I suggest you add a drop shadow on the blades only for a better feel and effect.
Notes: Great spray Focus, keep up all the good work and I can't wait to see more from you.
Pros: I'm seriously amazed. I love this spray, it really looks like it's coming out of the wall. The quality is top notch and it looks really good ingame.
Cons: None, you did a great job on this spray
Notes: Well done, keep it up!