Pieneman, Nicolaas – Willem III (1817-90), koning der Nederlanden, 1856 Rijksmuseum: part 1

The picture has something of this: people, sword, royalty, wear, weapon, armor, monarch, portrait, man, veil, crown, outfit, war, tunic, military, soldier, leader.
Perhaps it’s a painting of a man in a military uniform standing in front of a red curtain and a table with a white tablecloth and a red cloth on it.