it depends what you put into it, how much you have, how well you advertise it, etc.
as an actual painting, i can't say, since this is really a print site
if you were to print this - it would have to be fixed as the crop is bad around all the edges. you should charge more for the original too.
selling only originals means that you won't easily show in the search since it's sales based, and it limits your keywords. but in any case, you have to do the leg work to get people to see your things.
---Mike Savad
MikeSavad.com