Dawnie, might I make a suggestion? You know Nyome, so you probably know about this already, but...
G.A.S.O.C. But we have a guide to setting up shops that might help.
The REAL question is, how much are you not willing to do it for? Your prices better be higher than that. ^^ Because it doesn't matter what other people charge for their art...your art is unique to you. (Can you tell I'm an art shop owner? I have a flat rate of 4k...for chibis!)
xd so you go ahead and charge whatever you feel is reasonable, and don't be ashamed to raise your prices if it gets difficult to keep up with.
The natural media (colored pencil, maybe?) onelooks nicely blanded and shaded, so I'd say it's pretty good quality. Probably not as time consuming as CG, but it takes real materials, which cost money. 1-2 k?
Your CG is really good. If you spend a good bit of time on it, don't let it walk away for less than a couple k. I would say those full-bodies are worth about 5 k, give or take, for a standard commission. I have no doubt you could potentially get more in a contest or auction.
The animals are cute but look a bit forced...maybe it's because they have straight outlines when most animals are furry and the fur affects their outline. So they probably wouldn't go for quite as much. You're still better than me, though.
xd
You might also consider a price-by-piece method, where you give an estimate according to the request.
...I hope this helps.
sweatdrop If not, I just wasted a lot of typing!
blaugh 
