I think this is a cultural thing. Why would he have any problems with you showing your naked body to anyone? It's not like you're having sex with the artists. You wouldn't think twice about shedding your clothes on a nude beach, would you?
He might say "no", anyway. For undisclosed Domly reasons?!?
My mother was a nude model for painters when she was a student. She showed me a few sketches she got as gifts. If she could be relaxed about it, anybody can. I wouldn't call her an exhibitionist. Sexually liberated perhaps, but not exhibitionist.