This drawing is a study for The Princess Badroulbadour, 1908 (Tate Gallery N03953), a portrait of the artist's three children, John, Betty and Rachel, in fancy dress as characters from the 'Aladdin' story in The Arabian Nights. The drawing is of his son, but in the painting the pose with folded arms was used for one of his daughters. John was the Director of the Tate Gallery from 1938 to 1964. He is represented in a 1938 oil painting by his father, Portrait of Sir John Rothenstein C.B.E. (Tate Gallery T01869). The Tate Gallery also owns a second study for The Princess Badroulbadour (Tate Gallery T01248).
Robert Speaight, William Rothenstein: The Portrait of an Artist in his Time, London 1962, pp.225, 325