Pfantselt, Lucas Conrad – Portrait of the architect Francesco Bartolomeo Rastrelli Hermitage ~ part 10

The picture has something of this: people, portrait, wear, medal, leader, royalty, monarch, woman, music, man, administration, jewelry, sash, military uniform, duke, two.
Perhaps it’s a close up of a painting of a man wearing a suit and holding a piece of paper in one hand and writing.