portrait gallery Credit: “Sitting Bull” (detail) by Rommler & Jonas Lithography Company (after Rudolf Cronau), hand-colored collotype, 1885. National Portrait Gallery, Smithsonian Institution (left). “The Botanist” by Hung Liu, oil on canvas, 2013. San Francisco Museum of Modern Art; gift of Lorrie and Richard Greene and Accessions Committee Fund purchase. © Hung Liu (center). “George Washington Carver” by Betsy Graves Reyneau, oil on canvas, 1942. National Portrait Gallery, Smithsonian Institution; transfer from the Smithsonian American Art Museum, gift of the George Washington Carver Memorial Committee to the Smithsonian Institution, 1944. © Peter Edward Fayard (right).