Bartholomeus van der Helst – Portrait of Paulus Potter (1625-1654) Mauritshuis

The picture has something of this: people, portrait, wear, woman, music, performance, musician, indoors, leader, facial expression, singer, outfit, administration, chair, business, man, side view.
Perhaps it’s a painting of a man in a black dress sitting in a chair with a paintbrush in his left hand and a palette.