How Much is My Art Worth? by CelebrityPortraits, journal
How Much is My Art Worth?
CaiBurton (https://www.deviantart.com/caiburton) has created a group aimed at answering that question!
~HowMuchIsMyArtWorth (https://www.deviantart.com/howmuchismyartworth) is a group where you can submit your work and it'll be graded into a suggestion for how much you should sell it for. It should be stressed that these are just guidelines - as there are so many other factors to consider, such as time, medium etc - but it can be helpful to have a rough figure in mind.
Right now, the group is only small, so it doesn't have chance to function properly, but with more members, I'm sure it will grow and develop into a valuable page.