Be careful covering something so large. You don't want to end up with a big black blob! I agree with below, find a great artist, and rework this if you can. Some great shading and it could look good.
I would be thrilled if that was my first coverup to do, dude, just rework that one, add tons of black and just make it a better version of what it is. with super crazy eyes, teeth and details, maybe something "behind" it would look good