Richard Cosway, Portrait of Catherine Clemens and Her Son, John Marcus Clemens, c. 1800, watercolor on ivory in a gold and split pearl frame, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/120827

Horace Hone, Portrait of Lady Grace Anna Newenham, 1784, watercolor on ivory, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/121273