All join requests are approved automatically- so there's no need to include anything in the message when joining.
Members are welcome to submit however many devs to the gallery as they would like- However, each dev must be approved before it will show up. It just needs one vote from either zombie-jill or vzerby to be accepted.
All types of art are acceptable, including literature and graphics, so long as they have some relevance to the Splinter Cell series. (That includes cross-overs, too~)
Mature Content is also acceptable, so long as the devs. are properly flagged as such.
Keep it friendly. Only critique pieces of the artist requests it, don't be insulting or rude, stay on topic... typical common sense stuff.