XIR155325: Anatomical Study (pen and ink on paper), Vinci, Leonardo da (1452-1519) (after) / Louvre, Paris, France / Bridgeman Images

GIA4811914: Leonardo da Vinci self-portrait, Vinci, Leonardo da (1452-1519) (after) / Private Collection / Bridgeman Images

XKH179010: Study of St. Sebastian, 1480-81 (pen & ink over pencil on paper), Vinci, Leonardo da (1452-1519) / Hamburger Kunsthalle, Hamburg, Germany / Bridgeman Images

ROC700111: The veins of the arm, c.1508 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC399233: The anatomy of a bear's foot, c.1485-90 (pen & ink with heightening over metalpoint on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR323477: School of Athens, from the Stanza della Segnatura, 1510-11 (fresco) (detail of 472), Raphael (Raffaello Sanzio of Urbino) (1483-1520) / Vatican Museums and Galleries, Vatican City / Bridgeman Images

MEV5045229: Codex Atlanticus, sheet 30 verso, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC615079: The Heart, lungs and other organs, c.1508 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC443646: Studies of the heart and pulmonary vessels, c.1511 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XAB3697433: Mona Lisa at the Age of 12, 1977 (oil on canvas), Botero, Fernando (1932-2023) / Museo Botero, Bogota, Colombia / Bridgeman Images

MEV5047309: Codex Atlanticus, sheet 1058 verso, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC3703867: A study of drapery for a Salvator Mundi, c.1504-8 (red chalk with touches of white chalk and pen and ink on pale red prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC409849: The arm of the Virgin, c.1508-10 (black & red chalks, pen, brush and ink heightened with white on red paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

MEV5046880: Codex Atlanticus, sheet 844 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC478415: A rocky outcrop, c.1510 (black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC443714: The head of a youth in profile, c.1510 (chalk on red paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC409854: The muscles of the upper spine, c.1510 (pen & ink with wash, over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC409848: The drapery of a kneeling figure, c.1491-94 (brush & black ink heightened with white on blue prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC478422: A standing masquerader, c.1517 (black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

OLA235960: Reconstruction of da Vinci's design for an automobile (wood), Vinci, Leonardo da (1452-1519) (after) / Istituto e Museo di Storia della Scienza, Florence, Italy / Bridgeman Images

ROC5892727: Recto: The bones and schematised muscles of the leg, c.1510 (pen & ink over traces of black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3899937: UV image of studies of hands, c.1480 (metalpoint, much faded, on pink prepared paper) (see also 3899938), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR217648: Dodecahedron, from 'De Divina Proportione' by Luca Pacioli, published 1509, Venice (engraving) (b/w photo), Vinci, Leonardo da (1452-1519) / Bibliotheque Nationale, Paris, France / Bridgeman Images

ROC493253: Marsh marigold (Caltha palustris) and wood anemone (Anemone nemorosa), c.1505 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC399276: The Skeleton, c.1510 (pen & ink with wash over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

FIA5399582: Study of Two Warriors' Heads for the Battle of Anghiari, 1504-05 (black chalk and sanguine on paper), Vinci, Leonardo da (1452-1519) / Museum of Fine Arts (Szepmuveszeti) Budapest, Hungary / Bridgeman Images

ROC3955998: The rivers and mountains of central Italy, c.1502-4 (pen and ink, and brown and blue wash, over black chalk), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3930012: A plan of a weir and embankment on the Arno east of Florence, 1504 (pen & ink with brown and blue wash, over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC487772: Asses and an ox, c.1478 (pen & ink with chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

GIA4707673: Battle of Horsemen Study for the Battle of Anghiari (opposing the Milanese against the Florentines on 29/06/1440) Drawing in the pen of Leonardo da Vinci (Leonard de Vinci) (1452-1519) Sun. 14,7 x 15,5 cm Venice Gallerie dell'Accademia, Vinci, Leonardo da (1452-1519) / Gallerie dell'Accademia, Venice, Italy / Bridgeman Images

MEV5045480: Codex Atlanticus, sheet 149 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

XEE4145196: Portrait of Leonardo Da Vinci (Leonard de Vinci) (1452 - 1519) from his self-portrait., Anonymous / Private Collection / Bridgeman Images

FIT167665: The Ermine as a Symbol of Purity, c.1494 (pen and brown ink over black on paper), Vinci, Leonardo da (1452-1519) / Fitzwilliam Museum, University of Cambridge, UK / Bridgeman Images

ROC3703868: Studies of drapery for a Salvator Mundi, c.1504-8 (red chalk with pen and ink and white heightening on pale red prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5321249: The throat, and the muscles of the leg, c.1510-11 (pen & ink with wash over black chalk on paper) (recto of 399265), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC399226: Studies of horses and soldiers for the 'Battle of Anghiari', c.1503-04 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images