Hey, I've seen your art, and just my opinion, the prices people are suggesting are way too low. Your realistic art is gorgeous and I think a fullbody should go for at least $35+. In fact, I don't really think you should be selling your realistic art on this site. People here are mostly interested in chibi-style things and don't pay fairly for... Well anything really, but realistic art especially.
You can do whatever you want, but if I were you I would sell my art on a more appropriate site like DeviantArt or whatever else you can find.
Thanks!