Caroline de Bassano, Marquise d’Espeuilles John Singer Sargent (1856-1925)

The picture has something of this: people, portrait, wear, woman, dress, fashion, jewelry, model, veil, gown, necklace, costume, fashionable, pants, opera, nude.
Perhaps it’s a painting of a woman in a white dress with a yellow flower in her hair and a blue shawl.