Probably Jean Drouart, ‘Armor of Infante Luis, Prince of Asturias (1707–1724)’, 1712, The Metropolitan Museum of Art

dated 1712; French, Paris
http://www.metmuseum.org/art/collection/search/24937

Image rights: The Metropolitan Museum of Art (Purchase, Armand Hammer, Occidental Petroleum Corporation Gift, 1989), licensed under CC0 1.0 Universal