Bitcoin Talk forum (Bitcoin Collectables) was the original marketplace 

Then scarce.city was the first for doing Lightning auctions, I’m slightly biased (honorary founder)

Now there’s a scattering of other sites with groups of artists but using fiat platforms unfortunately 

Plebeian.Market (founder I’m biased) will have a dedicated marketplace for artist soon but 100% on nostr bitcoin 

You can check out my old personal website for shits and giggles… laser cut bitcoin and nostr “art” 😉 

https://hodlr.rocks