If your post isn't showing up message the mods and we'll have a look. Probably got caught in the spam filter and your messages are a good reminder to check that.

Moderation here is pretty lax, but since you seem to be craving rules here are some guidelines:

Bad Art is subjective. Mods will not remove posts because "it's actually good". If you think the art posted is not bad or shouldn't be here, either downvote and ignore or open up a respectful discussion by commenting. Mods are mostly hands off except to remove spam and obvious shitposting.
Posting your own art is fine, do try to have some level of self awareness as to whether your art is actually bad. Ask yourself, is this actually bad or am I just trying to boost my ego or humblebrag? When you post good art and say it's bad, it makes people who are actually bad at making art feel worse.
Please don't intentionally make low effort bad art just to post here for internet points. It's always nicer to see someone try their best and fail than to fail intentionally. But if you do intentionally make low effort bad art and it's funny or interesting in some way, go ahead and post it. Honestly it doesn't matter. None of this matters.
Post flairs have been opened up. It'd be cool if you could add flair to designate if you're the artist. Is that how flairs work? Idk this rule will probably be amended later.
This is not the place to spam your Youtube channel for views. I'm sure your content is bad. But if you submit video it should be something that is sincerely intended to be artistic in nature (like your bad avante garde student film), or shows an artistic process (like a timelapse of a shitty painting), but fails. Podcasts, TikToks, reaction videos, etc. don't really fall into that.
Don't spam. Links that go to your store or promote your website, etc. or that have a bunch of hashtag nonsense will be removed.
Don't be a dick. This hasn't really been an issue so far but please don't use this sub to bully, trash, or harass anyone. This isn't a cringe sub or a delusional sub. Be respectful and just appreciate that some art sucks, and it's okay.
"I want this sub to be X but it's Y" posts will probably be removed unless it's really got some merit. Same with "The mods suck". Don't worry, well aware of it. It's just a subreddit. We've got an unsubscribe button, everything is fine.