Actually honestly, as an artist, I like drawing the fat ugly people best. They were more interesting. Course it didn't help that my best looking model did NOT use anything to hold back body oder. ha! And of course there was that "too skinny to be real" model with the tampon string hanging out. ugh
But yeah, you should have asked your Dom, and yes, you should do it. As an artist, I never saw sex...I saw curves, shadows, grace, and amazing artistic splender. Plus you can ask to take photos of the art, or maybe even get some sketches of yourself.