Portrait of William Petty, 2nd Earl of Shelburne, 1st Marquis of Lansdowne (1737-1805) Jean Laurent Mosnier (1743-1808)

The picture has something of this: people, wear, portrait, man, outfit, two, woman, royalty, music, jewelry, facial expression, leader, recreation, military, uniform, medal.
Perhaps it’s a painting of a man in a red uniform holding a piece of paper in one hand and sitting down in a chair with a book in his other hand.