GEnerally, think of the category postlength as a minimum requirement, rather than reccommended length. It's fine to write advanced level posts in casual, as long as you accept othersmay not match you.

Also, [url=https://www.roleplayerguild.com/users/captainmanbeard]CaptainManbeard[/url] is a GM who also likes to use pictures and videos in posts, you may wanna check out some of his games, you may feel right at home there :)