The idea of the pool is pretty simple, add any character who is sitting on their feet.
Adding an ass focus picture to this pool is okay, but every post has to have the feet of the character(s) it's based around involved.
Regarding AI Generation, only add it if it's worthy enough. If it looks bad, don't add it.
Regarding posts with alternate versions, add the version with the least amount of clothing, and only 1 version.

When delete mode is enabled, clicking on a thumbnail will remove the post from this pool.