Made me log in just to answer this.
Look at what other people are charging and find a happy medium that you feel that you are getting paid for the amount of work you do.
DO NOT DO PER HOUR. - People keep suggesting this to people but its just about the stupidest thing to suggest to someone. Its the "lazy" answer. Some people can kick off what you did in ten minutes, some will take them 5 hours to do it. So which one should get paid more?
Its about finding someone to help you decide the quality of your work. Which also isnt easy to do off one picture. If you want, post at least three images of Ragnarok that you think you can always come to the same quality of. Then people could help you more.
Wpe I think is normally 150m/1k or 10$.
I think that is a great starting point. Its easier to determine how much in $ you could sell it for. This is of course an "artist thing". Things like how much you value your work, how much others value your work, how popular you are, and a bunch of things effect how much you can actually charge.
Edited by Mayhem, 27 February 2016 - 11:46 AM.