Seated Nude Model Christoffer Wilhelm Eckersberg (1783-1853)

The picture has something of this: people, man, portrait, wear, facial expression, music, athlete, position, musician, indoors, shirtless, recreation, singer, ailment, woman, side view, room, furniture.
Perhaps it’s a painting of a man in a towel sitting on a chair with a cane in his hand and looking at something in the other side of the picture.