si-national-portrait-gallery:Ann Dorothy Martineau, Charles Turner, 1833, Smithsonian: National Port
si-national-portrait-gallery:Ann Dorothy Martineau, Charles Turner, 1833, Smithsonian: National Portrait GallerySize: Image: 27.1 x 22.3cm (10 11/16 x 8 ¾")Medium: Mezzotint on paperhttps://npg.si.edu/object/npg_S_NPG.82.3 -- source link