Haha! When I saw it in your post I thought "Hey, she looks familiar" Took me a minute to remember it  was a Goya. I hope they weren't asking too much, considering... 

Goys'a  painting is actually something of a copy - a theme so to speak - in a sense. I think Giorgione did it first. Then Titian with the Venus of Urbino. Then Manet did his version Olympia. There's probably a bunch more. Seems that nudes have been quite popular even though they mostly hid them in a closet!