Wow Aya, does it really matter? ._.
This is a contest that said anything related to heRO or RO was allowed, I see no problems with drawing other players or whatnot. Heck one of Altaire's screens used NOW is of her and her friends all dressed in green under a tree.
I see no problems, I thought it was awesome, and I think this sort of thing is harmeless. It is not as if they are trashing other guilds or something.