Portrait of the poet Gabriel Romanovich Derzhavin Vladimir Borovikovsky (1757-1825)

The picture has something of this: people, monarch, portrait, royalty, sash, wear, man, leader, duke, mustache, necklace, lid, facial hair, pants, crown, prince.
Perhaps it’s a painting of a man in a blue coat sitting at a desk with a pen and paper in front of him and a green curtain behind him.