Portrait Of Sir Edward Thomason (1769-1849) Samuel Colman (1780-1845)

The picture has something of this: people, portrait, man, wear, jacket, music, outerwear, lid, leader, facial hair, necklace, jewelry, pants, mustache, outfit, musician.
Perhaps it’s a painting of a man in a black suit sitting in a chair with a medal around his neck and a green sash.