Mrs. William Henry Vanderbilt John Singer Sargent (1856-1925)

The picture has something of this: people, woman, portrait, wear, model, performance, music, dancer, dress, musician, light, costume, girl, singer, fashion, dancing.
Perhaps it’s a painting of a woman in a black dress sitting in a chair with her hands on her knees and her right hand resting on a flower in her left hand.