Charlotte,
I think you missed my point, perhaps. I was looking at your assertion that "The lens, [i.e. picture], shows us who we are not what we think we see." For this wonderful detective home with his family, taking pictures of his daughter with her many friends, his pictures would be of a happy father, not of a detective. So that's why I questioned how we apply your aphorism.
I think there's some sense of truth in your statement, but it needs a little a little more. Maybe, "The "sum" of all the various pictures taken by a person over a long period, might describes the photographer more than the varied subjects the lens is aimed at."
I'm glad to provided your saying as a stimulus to asking, "Just what are we showing when we share photographs?"
Asher