 A series of nine full-length portraits by Larkin formerly owned by the Earls of Suffolk and now known as the Suffolk Collection is housed in Kenwood House, London.Although Larkin's role as a portrait painter is recorded in contemporary documents, no surviving works were attributed to him until 1952, when James Lees-Milne identified Larkin as the painter of two portraits in oil on copper at Charlecote Park of Lord Herbert of Cherbury and Sir Thomas Lucy III which had formerly been assumed to be the work of Isaac Oliver.The identification was based on a reference in Herbert's autobiography to a portrait of himself ordered by Richard Sackville, 3rd Earl of Dorset, a "Coppy of a Picture which one Larkin a Painter drew for mee, the Originall whereof I intended ... for Sir Thomas Lucy," Cleaning revealed portions of inscriptions that Lees-Milne suggested showed that the oval portraits had been cut down from rectangular originals.