I've never sold any of my work. I've given a few pieces away, I've got about 4 pieces at my parents house, but I've never actually had to figure out how much one of my drawings is "worth". An art collector has expressed interest in my "Butterflied" piece. She hasn't quoted an offer and I don't know what to suggest. Does anyone more experienced in these matters have any suggestions? I honestly have no idea what's reasonable; I don't know whether to price it at $50 or $500 or what.