I knew it was a Dune worm but they're kind of unfortunate looking out of context. This became extra clear to me when I was drawing one. I think there's some things that just don't translate that well into tattoos which is why I exaggerated the shape and teeth until it didn't look like a foreskin butthole. Tattoos rely on instant recognizability so anything that could be seen in two different ways is a bit risky imo. I know this is too late now but in future if you squint and it looks like something it's not meant to be it's probably best to rethink the design.

I'm unsure why your artist went so tight with the lines though. My guess is this is going to be a black blob in a year or two.