Self Portrait; a frontispiece for the artist's 'Book of Heads'. Etching and engraving, from a self portrait drawing now in the NPG (NPG 2815). Carington Bowles engraved and published Dighton's self portrait, in 1787. It was reprinted as the frontispiece to the 'Book of Heads', also published by Bowles, in 1795. 6x4.5 inches.