This is how not to cover up a tattoo.
There's also this:
And the classic 'void' stamp:
But this, by Lindsay Baker at the US-based Nite Owl tattoos, is how to do it:
Baker told Buzzfeed that it was her client's first tattoo "and apparently the girl who did it had been drinking".
"The whole tattoo took about two hours," she said. "He was so excited with the finished product!"