My SO is an artist (airbrush, drawing, digital) and a tattoo artist for a living and yeah, he gets asked this ALL THE TIME. Like - oh you artists live for art-making so you won't mind making my AWESOME FLYING TURKEY-BEAR picture for free, would you? It'll be so fun! It'll be great exposure!!!

Yeah, no. He doesn't get nasty or anything, but he's pretty firm about saying no, he has plenty of paying work to keep him busy.