Master of the Horse Heads, Children Playing with a Bitch and Three Young Dogs, 1453, etching, National Gallery of Art, Washington. https://dartabase.art/cite/nga/4401

Master of the Horse Heads, Ornament with a Cupid, a Satyr,  and Grotesque Figures, 1453, engraving on laid paper, National Gallery of Art, Washington. https://dartabase.art/cite/nga/8758

Master of the Horse Heads, Upright Ornament with Two Sirens, 1453, engraving on laid paper, National Gallery of Art, Washington. https://dartabase.art/cite/nga/8759