There are two distinct questions at play. One is whether the tattoos are copyrightable. The second is what counts as fair use if the tattoos are copyrightable.

There are two distinct questions at play. One is whether the tattoos are copyrightable. The second is what counts as fair use if the tattoos are copyrightable. Even if they decide tattoos are copyrightable, there might still be a ton of fair use categories to be decided on a case by case basis. I'd imagine that even if copyright applies to any of your examples, fair use is probably super broad in them.