Портрет С.И. Мордвинова. 1771 Carl-Ludwig Christinek (1730-1794)

The picture has something of this: people, portrait, leader, wear, man, veil, royalty, monarch, elderly, crown, sash, cape, pope.
Perhaps it’s a close up of a painting of a man in a black and white outfit with a feathered hat and a feathered shawl around his neck.