I've been using waterfall.social this past month and I love it! I've actually gotten more attention on my art there than anywhere else, despite it's small userbase. It's just like tumblr but with more emphasis on art and supporting artists (and also a much better community than tumblr lol)
Some features include a featured art section to help people get noticed, a commission marketplace, and plans for an anti-art theft system! (specific details about art posts here). They also allow nsfw content as long as it's tagged and legal, and they do a lot to make sure minors don't have access to that content
unfortunately they don't have a gallery feature, so I'm still waiting for artrise for all my gallery needs