Smart produced very few portraits of the British Royal Family. A drawing of George IV when Prince of Wales is in the British Royal Collection, inv, no. 420663 and the finished miniature is in the Louvre (see P. Jean-Richard, Miniatures sur ivoire, Musée du Louvre. Musée d'Orsay, Paris, 1994, p. 325, no. 602, illustrated and described as 'Portrait of a Gentleman'.