 One of the four Henry Collen portraits was of a John Avery titled "Surgeon", which is a watercolour miniature on ivory, being only 8" × 5".This piece is on display at Bodelwyddan Castle, as are two other works, an oil painting on panel of Robert Vernon by George Jones and Henry Collen, painted in 1848 and a portrait of Henry Bickersteth, Baron Langdale, painted in 1829, entitled Master of the Roles.This piece is also a watercolour miniature on ivory and only 4" × 3.