i wonder how the photograph made agni realize something was wrong?

this. ive thought about this. just who can be in that picture? the photographer said a picture when ciel was little. at first i thought that it could be a family picture but considering there was a panel showing ciel's figure, that may be not a family portrait. /siiiiiiigh/ i wanna see the pic too!!!!!!! (╯°Д °)╯╧╧