Artists certainly do have their communities, but they tend to be on other kinds of platforms. It wasn't very easy finding a warm community, at least when i was skipping around, not for any art, writing or else, then to find a Christian one was a bit more difficult, too. If you want one similar to Christian Writers,
Christian Forums seems similar and has an arts section, but i never joined the forum, so i don't know what it's like. However, mostly i see artist communities being on Discord, Cara, Instagram, Twitter, Bluesky, Twitch, Reddit, Facebook, so on and so on, and communities created by artists who have a course or school or some other kind of instructive platform. Whether this one or that one are warm or not, trial and error. So there's that.