Leonardo da Vinci: From Sketches to Paintings

• Study of proportions, from Vitruvius's De Architectura
  (60 Kb); Pen and ink, 34.3 x 24.5 cm (13 1/2 x 9 5/8 in); Accademia, Venice
  

• Vitruvian man
  

• Skull
  

• Womb
  (thanks to Michael Trefry)
  

• Head of a Young Woman
  (190 Kb); Accademia, Venice
  

• Virgin and Child with the Infant John the Baptist and St. Anne
  National Gallery, London
  sketch for the Madonna and Child with St. Anne and John the Baptist, often identified as the Burlington House Cartoon. Leonardo's later treatment of the same subject (without John the Baptist) is in the Louvre.
  (thanks to Paul Stauffer, Simon Morris, Andrew Lieu and John Hutzler)
  

• The Virgin and Child with Saint Anne
  1510 (200 Kb); Oil on wood, 168 x 130 cm (5 1/2 x 4 1/2 ft); Musee du Louvre, Paris