I joined Mastodon.art as @hannahcomb. I've been getting such a good response from my art posts on this platform that I feel like I must promote it.
Internetty Jargon About Mastodon:
It is a micro-blogging platform, like Twitter, that supports photo posts, retweeting ("retooting"), favoriting, and more. It is decentralized, which from my limited understanding means it lacks advertisements and has robust feed-editing features while still feeding into a larger federated tweet stream. At the moment it should not be viewed as a robust archival platform, but it is still being developed and worked on.
If Mastodon.art isn't the perfect fit for you, you can join a different instance of Mastodon and still have your tweets show up in the larger overall federated stream. It's nice!