To patronize his art: Hold off
Here’s the thing: your partner can get a day job just like every other artist has to while he pursues a singing/acting/comedy/writing career. Heck, you probably have some passion projects of your own but you aren’t counting on someone else to fund them. You have a job to fund your dreams—not someone else’s. No matter how talented of an artist he may be, he isn’t above working for a paycheck until his paintings start making money.