Can I ask for a refund on an art piece?
Maybe. Why do you need a refund for the art piece?
I don't like the quality of the art piece
I'm sorry you don't like the piece of art you got, but you should still learn to appreciate it because the artist took so much time trying to get it all right. Artists struggle to make money too.
I don't care. I demand a refund.
It is up to you if you still want to demand a refund but at least try to appreciate the work that the artist put in. Let them know it is not to your taste but it is a good piece of art.