Sources and Licenses

The portrait references on this site are photographs of public-domain works, published by the museums that hold them.

We use only images the museum itself marks as public domain, under CC0 or the Public Domain Mark, and keep each work's museum record with it. The value studies and palettes are worked out from those images by the same code as the free tools on this site.

The Metropolitan Museum of Art

The Met releases images of public-domain artworks for unrestricted use under Creative Commons Zero (CC0). Open Access at The Met.

Juan de Pareja (ca. 1608–1670), Velázquez (Diego Rodríguez de Silva y Velázquez), 1650. Museum record, retrieved 2026-11-04.
Hayne Hudjihini, Eagle of Delight, Henry Inman, 1832–33. Museum record, retrieved 2026-11-04.
Portrait of a young woman in red, Roman Period, 90–120 CE. Museum record, retrieved 2026-11-04.
Portrait of an elderly lady with a gold wreath, Roman Period, 100–125 CE. Museum record, retrieved 2026-11-04.
Portrait of the Boy Eutyches, Roman Period, 100–150 CE. Museum record, retrieved 2026-11-04.
Self-Portrait, Rembrandt (Rembrandt van Rijn), 1660. Museum record, retrieved 2026-11-04.
Study of a Young Woman, Johannes Vermeer, ca. 1665–67. Museum record, retrieved 2026-11-04.
Portrait of a Woman, Piero del Pollaiuolo (Piero di Jacopo Benci), ca. 1480. Museum record, retrieved 2026-11-04.
Edward VI (1537–1553), When Duke of Cornwall, Hans Holbein the Younger, ca. 1545; reworked 1547 or later. Museum record, retrieved 2026-11-04.
Madame Edmond Cavé (Marie-Elisabeth Blavot, ca. 1806–1883), Jean Auguste Dominique Ingres, ca. 1831–34. Museum record, retrieved 2026-11-04.
The Writing Master, Thomas Eakins, 1882. Museum record, retrieved 2026-11-04.
Carmelita Requena, Thomas Eakins, 1869. Museum record, retrieved 2026-11-04.
Self-Portrait, Samuel Joseph Brown, Jr., ca. 1941. Museum record, retrieved 2026-11-04.
Head of an Old Woman, Orazio Borgianni, after 1610. Museum record, retrieved 2026-11-04.
Portrait of a Sri Lankan Tamil, Samuel Daniell, 1806–1807. Museum record, retrieved 2026-11-04.
Child's Head, Jean-Baptiste Greuze, . Museum record, retrieved 2026-11-04.
Head of a Young Man in Three-Quarter View, Giovanni Battista Tiepolo, 18th century. Museum record, retrieved 2026-11-04.
Portrait of Alain de Coëtivy (1407–1474), Jean Fouquet, ca. 1451–55. Museum record, retrieved 2026-11-04.
Head of a Boy, Master of the Legend of Saint Ursula, 15th century. Museum record, retrieved 2026-11-04.
Self-portrait (recto); Study for a self-portrait (verso), Marie Bracquemond, ca. 1870. Museum record, retrieved 2026-11-04.
Louise Brongniart, Jean Antoine Houdon, 1779, after a portrait of 1777. Museum record, retrieved 2026-11-04.
Voltaire (François-Marie Arouet) (1694–1778), Jean Antoine Houdon, 1778. Museum record, retrieved 2026-11-04.
Lot, Chief of the Spokanes, Olin Levi Warner, 1891; cast 1906. Museum record, retrieved 2026-11-04.

Art Institute of Chicago

The Art Institute of Chicago releases images of public-domain artworks under Creative Commons Zero (CC0). Open access images.

Portrait of a Princess, Mughal, India, 17th/18th century. Museum record, retrieved 2026-11-04.
Bust of Saïd Abdullah of the Darfour People, Charles Henri Joseph Cordier, 1848. Museum record, retrieved 2026-11-04.
Bust of a Woman, Charles Henri Joseph Cordier, 1851. Museum record, retrieved 2026-11-04.
Head of a Luohan, China, Northern Song, Liao, or Jin dynasty, c. 11th century. Museum record, retrieved 2026-11-04.

Cleveland Museum of Art

The Cleveland Museum of Art releases images of public-domain artworks under Creative Commons Zero (CC0). Open Access.

Jewel Portrait of a Young Girl, India, Mughal, 17th century, c. 1660. Museum record, retrieved 2026-11-04.
Portrait Study of Seigen, Japan, Kamakura period (1185–1333), 1300s. Museum record, retrieved 2026-11-04.
Portrait Head Vessel, Peru, North Coast, Moche style, c. 200–550 CE. Museum record, retrieved 2026-11-04.

Rijksmuseum

The Rijksmuseum marks free material as Public Domain or under a CC0 dedication, and the record of each work here carries that mark. Information and Data Policy.

Portrait of an African Man (Christophle le More?), Jan Jansz Mostaert, c. 1525 - c. 1530. Museum record, retrieved 2026-11-04.
Self-portrait, Rembrandt van Rijn, c. 1628. Museum record, retrieved 2026-11-04.

Guides and tools

Each guide lists its own sources at the end. The free tools use the Paintsight app's own maths, and the test suite checks them against the app's answers.