On 14 November, Sotheby’s will present A Street (1926) and Calla Lillies on Red (1928) by Georgia O’Keeffe in a Contemporary Art Evening Auction for the first time. The stunning Cottonwood Tree in Spring (1943) will also be featured at the American Art Auction, taking place on 16 November. Succeeding the sale of Georgia O’Keeffe’s iconic flower painting Jimson Weed/White Flower No.1 (1932), Sotheby’s will again be offering significant works by the modernist artist to...