Imitator of Rembrandt – A Study of an Elderly Man in a Cap Part 3 National Gallery UK

The picture has something of this: people, man, facial hair, lid, portrait, mustache, veil, wear, leader, Renaissance, elderly, military, uniform.
Perhaps it’s a close up of a painting of a man with a beard wearing a brown coat and a brown hat with a red stripe around his neck and a black hat.