Apparently, this shot was taken on a whim. The photographer Edward Steichen had taken a bunch of photos, none of which he liked. Finally, he told Greta Garbo that her haircut was horrible. She reacted by pushing all her hair back, he took the picture, and voila, portrait photography history was made.
Ag, she looks SOOO happy. The poofiness of the dress and hair, her boots, her body position, all just work so well together.
Another, great shot of a great lady.