Thanks Kacparov for your question. You're the second member to ask this. I don't really know and I'm not kidding. There are four of us Admins and one of us (not me) put that picture there. I just wish the Admin who did it admit it in this forum and explain to us all, especially to our members, who is in that picture. It's just fair play.
Picture

It's Alexandra Kosteniuk: http://www.kosteniuk.com/
You said you don't know who's on your group's picture, don't you really know? Or just kidding?