In the Witch context, you can add the tattoos, but make the actual art, descriptions and functionality in context of being enslaved by a witch. Some tattoos forced on you that are actually runes that have a function (like the classic ovaries tattoo on the stomach making the protagonist horny all the time), others you can get yourself to counter those tattoos/runes or other effects pushed on you.
And then you can go even further making combinations of tattoos have unforeseen effects. Like getting rune cursed to be horny, then you trying to counter it with a rune of your own, but turns out that those two runes together get a different meaning and suddenly instead of you always being horny, everyone around you is always horny and try to force themselves on you.