Richard Avedon photographed by Alfred Eisenstadt, 1963
A photographic portrait is a picture of someone who knows he's being photographed, and what he does with this knowledge is as much a part of the photograph as what he's wearing or how he looks. He's implicated in what's happening, and he has a certain real power over the result.
-Richard Avedon
RICHARD AVEDON: Photographs 1946-2004 at SFMOMA