Possibly a portrait of Major General Lachlan Macquarie (1761-1824), Governor of New South Wales John Opie (1761-1807)

The picture has something of this: people, portrait, man, wear, royalty, leader, outfit, jacket, theater, necklace, veil, crown, music, opera, lid, profile.
Perhaps it’s a close up of a painting of a man in a red suit with gold trimmings and a white hair wearing a red jacket and gold trim.