I'm not sure if there is option to sell art works for crypto, but for sure it is interesting market based on blockchain. Not only market, but also an application that certifies the authenticity of works of art just like the confirmation of human fingerprints.

You can read more about this project here: https://www.4art-technologies.com/

There is definitely an internal market and the ability to contact galleries, but I haven't used it myself yet, so you have to check it out by yourself.