To answer the original question, if the shop you're in doesn't have the aforementioned Higgs flash, then you're probably in the wrong shop.
Or just say you want a "Higgs mummy" or "Higgs druid" or "Higgs bat", etc. I'm hoping the tattooer will know what you're talking about.
At the same time, I would want someone that's stoked on Higgs to do the tattoo as well, or like others mentioned, someone that may even know him.
There are tons of tattoos I want in the new Eleven Fourteen book, the Zeis book, the new Great Unknown book, 400 Flash from Rodin and Miller, etc. I haven't bought those books, but I wouldn't lift any of those images off the Internet neither. If I see flash that I really like, I'm just gonna track down that tattooer and get tattooed by them. Or hopefully the shop I'm at has the books and I could just pick out an image from there.
Totally rambling at this point.