Thomas Eakins, American, 1844-1916 – Portrait of Mrs. Frank Hamilton Cushing Philadelphia Museum of Art

The picture has something of this: people, portrait, wear, man, woman, music, nude, shirtless, ballet dancer, veil, Renaissance, indoors, son, dancing, position, lid.
Perhaps it’s a painting of a woman in a black dress with her hands on her knees and her right hand resting on the arm of another woman’s shoulder.