It would of course be elegant, and it was a vew from behind, not from the front. You saw the back of her head among other things. What if he had more than one of such paintings?
Well, a girl's opinion of "elegant" may be different from a guy's, but I'd be cool with it. (Straight) Men are supposed to like women, so I'd maybe like that he was comfortable and tasteful about it. And we all like sexy images.
I might be a little worried if they were on every wall though. It shouldn't be the only interesting or tasteful art you have.
Like they said it depends on if they were trashy or not. If I was nice in a classical art way, or even abstract, then ok but not some nude chick form playboy, or porn