I suggest looking around at what other artists prices are, and then tweaking based on how easily/quickly you can get something done. And of course prices can/will change based on subject matter such as complexity of characters and ect.

It really is honestly up to you. I've gotten some front and back ref sheets, with a clothed version of the character, for 40$ from an artist. Other artists would charge upwards of 100$+ for that. Usually around 80$ for just a front and back view.

The best thing to do is to determine what you want to do with your art. Are you doing this as job or hobby, cause that also helps figure out price. Combine that with how many commissions you are willing to take on at a time, no one likes to see a que list of like 20 people waiting a month for their art. If you're doing this as a job and can only manage a few commissions at a time, go for a higher price like around 80$ usd for a full color image. If you're doing it for a job and can take several commissions at a time, a medium price range, around 60$ usd for a full color image.

I mention this because you kinda sorta do have other artists to compete with, at least if you are doing this as a job rather than hobby. So that really plays into things.

Your comment is very usefull, I wanted to take no more than 5 slots so I'll be able to do all the drawings faster but with quality of course
I would like to take for now 50 or 60 $ for full drawings , full bodies maybe umm 20/25$, chibies 10 or 15$, I really put much effort in my works and I use all my free time to finish my to do list so .. I think its fair c:

So a full body + back ground would be around 50/60$, where as without the background it would be around 20/25$ eh? Sounds fair if you ask me.

yes, for me backgrounds are hardest part of a drawing and I put a lot of effort in)

I think your art is good enough for the $30-50 range, especially the stuff with backgrounds.

I may sell the full drawings with 50 or 60 $ because backgrounds are for me the hardest part in a drawing, the idea, the concept arghh so much to do xDD

I definitely agree with that!