I'm just one bad artist and don't have a ton of time or energy for returns and exchanges, so I don't do them.
That said, if you cancel an order prior to shipping, your full purchase price will be refunded.
After that, you're stuck with a piece of cheap, bad art with questionable resale value.
A Note on Opening Your Art:
To help ensure that your piece isn't damaged when opening it, please don't use scissors, knives, razors, letter openers, bladed weapons, chainsaws, etc. to open your painting. The mailer has pull tabs on either side of the sealing flap. Pull one of these tabs to open your piece and carefully remove your piece, which will be dutifully sandwiched between two sheets of protective 1/4" corrugated cardboard.