even if another tattoo artist does it, it will still be unique. hell, if the same artist does the same tattoo multiple times, each will be unique. it's not even remotely the same as seeing an image in Google image search, and using it for whatever without permission.
This is anathema to the whole industry though. You can't do this and also remain a tattoo artist in good standing with the rest of tattoo-dum. It's akin to a punk band calling the cops on someone in the crowd for singing along.