Leonardo, The Virgin and Child with St Anne and St John the Baptist, 1499-1500
Leonardo da Vinci, The Virgin and Child with St Anne and St John the Baptist (Burlington House Cartoon), 1499-1500, charcoal and chalk on paper, 55.7 × 41.2 inches
c. 1499-1500 (National Gallery, London)
http://www.smarthistory.org/the-virgin-and-child-with-st-anne-and-st-john-the-baptist.html
