>>29774
It's also that, in a person's main gallery, A.I. pictures and stock images aren't allowed, but I believe can be used as a thumbnail.
In terms of the age of the characters in art, some stuff you can get around it, and being there for quite awhile, I've seen some pretty risqué things posted in people's gallery's. So while it's not super strict as someplace like Reddit, there are some rules to follow even if they're lax on enforcing that thing specifically in the wider picture of the whole site.