Julia, go with your passion. You have the talent and you like it. Maybe you were never really cut out to be a teacher (or involved in education system) to begin with. I had a friend who left teaching english in public schools (in Poland) because of the lack of interest on student's part and went to strictly private lessons. She is very happy now. All her students are there, because they want to be. Probably once, long ago teaching was really rewarding. I've done a lot of professional training and it can be rewarding - just depends on the audience.
But back to the art. Don't give up on that. Part of the problem with being a JW is that all of our passions and interests were forced to the back burner to put kingdom interests first. You would have time for that later. Right... We sacrificed careers and passions for the borg. What a shame. You are still young, so you have time to pursue 'your' interests. It sounds like your husband is supportive, and if you are willing to do seasonal work to help out, go for it.
Nice work on your FB page. Don't give up.