The art of cover art

There's a series I read where each cover shows a new tatoo on the main character. In the book, her tatoos are rarely, if never, mentioned, but it's an interesting set of progression, especially since the series has gone long enough that she's starting to run out of space for body art. I think we still have one arm and two legs left. I give huge credit to the cover artist (Daniel Dos Santos) for such a daunting task of continuity. (and yes, the tatoos seem to stay in the right place, even if her pants start to get obscenely low.)

( the covers, if you want to see )