partner angry at requests for art nude photography

Since you refer to her as your partner, I assume you are not married. You should consult a lawyer as to your rights under your state's laws. If you are also business partners, you should review your partnership agreements.

Do a cost/benefit analysis -- and don't forget to include the potential costs imposed by a court to severe the relationship e.g child support, therapy for woman and child, property division, court costs and legal fees, You may decide you can't afford to be free.

Take this opportunity to regain your freedom. Or accept your fate.