A boy as a shepherd. The painting was in horace walpole's collection and is currently on long loan to his former house, strawberry hill house, twickenham. Walpole supposed the sitter to be the poet abraham cowley (1618-1667). Object Type: painting. Date: circa 1658-1660. Dimensions: height: 91.4 cm (35.9 in); width: 75.6 cm (29.7 in). Medium: oil on canvas. Collection: Dulwich Picture Gallery. A Boy as a Shepherd by Peter Lely c. 1659