Mrs. Waldorf Astor (Nancy Langhorne) John Singer Sargent (1856-1925)

The picture has something of this: dress, woman, people, fashion, veil, wear, portrait, model, opera, performance, wedding, glamour, gown, fashionable, bride, costume, stage.
Perhaps it’s a painting of a woman in a white dress standing in front of a doorway with her hands in her pockets and her right hand in her other hand.