[babblingfaces]

It depends on the kind, really. For the most part genital and nipple piercings would still be seen today as a very overtly sexual thing to do, all of which has its effects detailing the fall from grace for a character meant to be "pure". Not so much other piercings of course, but hey. As for tattoos... Well, they're illustrations... A lot of things can be conveyed in tattoos, doesn't have to be the usual tribal thing in which case is more of a "slutification" process than anything... Assuming there still is some manner of taboo associated to that too. In my country at least there does seem to be.

But for the most part I reckon both are more directly linked to slutification and then somehow make their way into evil corruption by the age-old association of promiscuity with sin, therefore with evil. And of course as a way to want to overtly sexualize the process too, sort of call attention to the sluttier side of the character and so on, so forth. I reckon it depends on the context for it to work, and I think it doesn't really work in the above as - as mentioned - the revealing demonic armour already sells the message across through and through, and the piercings only seem to banalize the piece.