Advertising your guild picture on GraalOnline Classic is not a bannable offense. This is separate to the issue of showing yourself on Classic though, but that isn't a bannable offence either. However, it isn't something which is appropriate for a game, the staff don't want it in their game, and people's personal pictures are going to be removed if they're used in guild logos. It's an issue of privacy really; there's a huge amount of young players and a huge amount of creeps.

There is nothing wrong with showing your art skills, using a funny picture, or y'know representing your guild like it's intended.

Promoting a Facebook game has nothing to do with encouraging the sharing of personal information, including pictures of yourself. That's what you're trying to suggest here, but the two aren't related at all.