One of my own. Fifteen characters in one scene. Ink and watercolors on hot pressed paper.
I started with the idea of looking down the hall of St. Clement's (see Seaborn for more on this) toward the end with the entrance, and having as many characters in the scene as possible--with the governess standing at the center with a push-broom. I also wanted some subtle action, the girls talking, nothing really dynamic, but a sense of things going on, conversations taking place, arguments, people sulking, consoling, listening. I'm not sure that I captured all that, but that's what I was going for.
Also--high in my mind was one of my favorite panels--two pager--in The Good Neighbors, book one of the Kin series by the incomparable Holly Black with art by the incomparable Ted Naifeh (who, among a bunch of other cool stuff, also illustrated the Subterranean Press edition of Caitlín R. Kiernan's Alabaster). Get The Good Neighbors and check out page 8 and 9 with Rue and her friends hanging at The Black Out. I love the mystery in this broad room view with faeries mixing with mortals and you know the humans can't see them. I had to check out every person in the room, checking for pointed ears, horns, any sign that they weren't mortal. It's just beautiful work.
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Click this link for the color version