Design a Japanese Hannya / Oni Mask for Sword Engraving

Hi, I'm working on building a replica of Bill's Katana from Kill Bill, and I need a nice demon/Hannya/Oni mask for the saya/scabbard. I'll be engraving this in wood, so it needs to have a clean/tattoo-style feel to it. I've included what original source material I have, as well as a mock-up that I've come up with. I'm unhappy with my mock-up, as you can probably guess. It's just not balanced, not kick-ass enough for this sword. I'm not looking for an exact match, I actually want something nicer!:) But it does need to keep more-or-less to something like the original art. But more even, more balanced. Please be aware that the original art that I've included came from screen shots from the film, and were in place on Bill's sword. The perspective is off a bit. I'm looking to pay around $50 dollars for this task. Thanks, jason