My Little Postcard Da Vinci's

 A detail from The Virgin of the Rocks (The Virgin with the Infant Saint John adoring the Infant Christ accompanied by an Angel), about 1491-1508
Leonardo da Vinci, 1452-1519
Oil on wood, 189.5 x 120 cm
Bought 1880
The National Gallery

 A detail from The Virgin of the Rocks, about 1491-1508
See above

 A detail from The Virgin and Child with Saint Anne and the Infant Saint John the Baptist ('The Burlington House Cartoon'), about 1499-1500
Leonardo da Vinci, 1452-1519
Charcoal (and wash?) heightened with white chalk on paper, mounted on canvas, mounted on canvas, 141.5 x 104.6 cm
Purchased 1962
The National Gallery

See above