Figure, Life, Undraped, Nude. Whatever you call your modeling, select MODEL IF YOU FIGURE MODEL FOR PAY.
Professor, Instructor, Teacher, Artist, Moderator, Scheduler. Whatever you call yourself, select ARTIST IF YOU HIRE AND PAY FOR FIGURE MODELS.
If you hire and pay for figure, life, undraped, nude models (whatever you call them) and you get paid for figure modeling as well, then select BOTH.