itch.io

Sure - at the moment it's all on Bluesky, under this tag: https://bsky.app/hashtag/FreeFantasyArt

I'm also considering adding to this geeklist on board-game geek: https://boardgamegeek.com/geeklist/191307/artwork-under-free-licenses-eg-creativ... but that one doesn't use images.

And I'm looking at maybe making my own document that lists a few dozen of what I consider the best sources for Fantasy TTRPG content, alongside links and sample images [or perhaps just thumbnails], that I can link on forums and the like when people are looking for ways to stretch their art budget.