Would it be some kind of rating on the main website of the project , I mean sellers and buyers votes.
if I understand you correctly, it seems to me that it is difficult to establish the rating of the artist. It is either interesting for an individual buyer or not.
I buy a painting and I like it. At the same time, my friend did not appreciate it at all. I think I only care about the quality of the transaction, the speed of delivery and the safety of the goods. But in general, I would like to leave feedback about the work on the platform.
I like your feedback ideas also. Feedbacks and then choose priority for artists prohibitions.