I like that you used the paper as part of the action - him ripping through it makes the image instantly interesting. At first I thought the shirt he had on was part of the paper caught in his pants, so it might be worth adding a hem or pattern - something to set it apart from the paper. You've done a nice job with the musculature across the chest/abdomen, but I think he needs a little more definition in his neck. His head appears to be in the right position, it just looks a bit disconnected. Overall, it's a fun piece! I hope the critique is helpful.

That is pretty sick!