Hide/Seek: Difference and Desire in American Portraiture catalogs last year's exhibition of the same name at the National Portrait Gallery, Smithsonian Institution. I think the curators' selection of which specific image or images should represent each artist was brilliant. Examples below.
Goat's Horn with Red
1945
Georgia O'Keeffe
1945
Georgia O'Keeffe
Una, Lady Troubridge
1924
Romaine Brooks
1924
Romaine Brooks
Arnold Comes of Age
1930
Grant Wood
1930
Grant Wood
Men Reading
1914
J.C. Leyendecker
1914
J.C. Leyendecker
Hugh Laing and Antony Tudor
1940
Carl Van Vechten
1940
Carl Van Vechten
Dancing Sailors
1917
Charles Demuth
1917
Charles Demuth
Djuna Barnes
1926
Berenice Abbott
1926
Berenice Abbott
Margaret French, George Tooker and Jared French, Nantucket
c. 1946
PaJaMa
c. 1946
PaJaMa
Joseph Cornell
1933
Lee Miller
1933
Lee Miller
Eight Bells Folly: Memorial to Hart Crane
1933
Marsden Hartley
1933
Marsden Hartley
Portrait of Marcel Duchamp
1925
Florine Stettheimer
1925
Florine Stettheimer
River Front No. 1
1915
George Bellows
1915
George Bellows
Nude
1947
Agnes Martin
1947
Agnes Martin
"Before she died, Martin attempted to reacquire and destroy all of her figurative works." – from the catalogue, p. 144.