Портрет графа А.М. Дмитриева-Мамонова. 1787 Mikhail Shibanov (1700s)

The picture has something of this: people, portrait, wear, leader, man, administration, politician, writer, music, elderly, theater, outerwear, facial expression, woman, necklace, musician.
Perhaps it’s a painting of a man with white hair wearing a blue coat and a black vest with a red sash around his neck.