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Portrait of American artist Georgia O'Keeffe (1887 - 1986), twentieth century. (Photo by Fred Stein Archive/Archive Photos/Getty Images)

Portrait of American artist Georgia O'Keeffe (1887 - 1986), twentieth century. (Photo by Fred Stein Archive/Archive Photos/Getty Images)

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April 1960: American painter Georgia O'Keeffe (1887 - 1986) stands in the sand on the side of a road, wearing a long black coat and a bandana, New Mexico. (Photo by Tony Vaccaro/Hulton Archive/Getty Images)

April 1960:  American painter Georgia O'Keeffe (1887 - 1986) stands in the sand on the side of a road, wearing a long black coat and a bandana, New Mexico.  (Photo by Tony Vaccaro/Hulton Archive/Getty Images)

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American artist Georgia O'Keeffe (1887 - 1986) poses outdoors beside an easel with a canvas from her series, 'Pelvis Series Red With Yellow,' Albuquerque, New Mexico, 1960. (Photo by Tony Vaccaro/Getty Images)

American artist Georgia O'Keeffe (1887 - 1986) poses outdoors beside an easel with a canvas from her series, 'Pelvis Series Red With Yellow,'  Albuquerque, New Mexico, 1960. (Photo by Tony Vaccaro/Getty Images)

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Portrait of American artist Georgia O'Keeffe (1887 - 1986), 1962. (Photo by Fred Stein Archive/Archive Photos/Getty Images)

Portrait of American artist Georgia O'Keeffe (1887 - 1986), 1962. (Photo by Fred Stein Archive/Archive Photos/Getty Images)