Sargent, John Singer (1856-1925) Madame X (Madame Pierre Gautreau) 1883–1884 Oil on canvas, 208.6 x 109.9 cm Metropolitan Museum of Art, New York Madame Pierre Gautreau (the Louisiana-born Virginie Amélie Avegno; 1859–1915) was known in Paris for her artful appearance.…