Portrait of Grand Duke Nicholas. 1814. Pavlovsk Palace Museum Orest Adamovich Kiprensky (1782-1836)

The picture has something of this: portrait, people, royalty, military uniform, wear, medal, leader, sash, military, monarch, uniform, administration, man, lid.
Perhaps it’s a painting of a man in a black uniform with a blue sash around his neck and a white star on his left side of his left arm.