ever since flash has been terminated, all my art keeps getting flagged as doesn't meet.

they didn't have an issue with it before, but now i can't keep any piece on this website for more than a week.

its demoralizing, because i spend Weeks to months on these animations. it gets a tonne of upvotes everytime

and then gets taken down because a few mods thinks pixel art is bad or whatever...

Example: https://e621.net/posts/2826025

To make it worse, there is NO Listing, or Ruleset on what this takedown ever even means. its just The mod personally didn't like it, so it gets taken down.
its the worst.

Inconsistent pixel sizes (your example pic has giant pixels for the dick, but small pixels for the flesh walls), and a bad perspective on the background (We're looking at so much floor that we shouldn't be seeing the characters side-on).

Some of your images were taken down by automoderator which means that the moderators thought it wasn't so bad that it had to be deleted, but also that it wasn't good enough to be approved. Those that were taken down by somebody you can send a DM to to ask what their reasoning was. Check the list, those that say "Does not meet quality standards" should have been by a specific staff member listed in the red bar. Click their name, then click on "Send Message" at the top of their page.