Portrait of Charles-Claude de Flahaut de la Billarderie, Comte d’Angiviller (1730-1809) Joseph Siffred Duplessis (1725-1802)

The picture has something of this: people, seat, furniture, portrait, wear, man, woman, facial expression, two, indoors, chair, sit, music, room, veil, easy chair, musician.
Perhaps it’s a painting of a man sitting in a chair with a piece of paper in his hand.