I love this photo of Picasso, his wife Jacqueline (with necklace), and Jean Cocteau (in tie) at a bullfight, as much for the casual elegance of the dress of the onlookers as for the attention lighting their expressions.
Of note: have a look at Picasso's daughter Maia, one row behind, and how she's done her scarf. It's a tricky look to pull off if you don't have an oval face, but if you do, it's worth trying on days when the hair isn't cooperating. Another, similar version here, in a fashion shot by Richard Avedon.
(top photo, Brian Brake:
Auckland Art Gallery Toi o Tamaki, gifted in memory of Brian Brake, by a friend of the artist, 1989)
(bottom photo: Richard Avedon, published in Woman in the Mirror, copyright © 2005, The Richard Avedon Foundation)