OK, I just have to dip my oar in again. You said the family has money and that the woman is a mural artist. Well, some (note the SOME) families with money got that way by chiseling prices down on everyone else, but then asking well over the going rate for their own services. She has the mind set that you are her servant and since she comes from a prominent/wealthy family, you'll know you're just a serf and be honored to GIVE your work away. Ask me how I know. Give in to her and you lose respect for yourself. Hang tough. Believe me, she doesn't give her customers any discount, and I'd bet on that!! Good luck to you.