seconding ArtStreet, aside from having a decent community there's also lots of little challenges that pop up now and then so if ever your stuck there's always a prompt or two to fall back on
I would say FurAffinity but that's not for the faint of heart or folks who aren't fond of stumbling onto the occasional swath of weird stuff on the front page or browse sections
In terms of other art focused sites some new ones I've seen crop up include:
- Sheezy.Art
- Buzzly.art
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Inkblot which is currently in closed beta afaik but you can check the carrd for other info
and
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Artfol which is still mobile only (iPhone + Android) but they are working on a desktop version
there was another site i remember popping up but i think something happened with one of the devs so i stopped keeping track someone else may remember/know the name of it