Virgin of the Rocks by Leonardo da Vinci (1482-1486)

Leonardo da Vinci [Public domain]

Source: https://commons.wikimedia.org/wiki/File:Leonardo_Da_Vinci_-_Vergine_delle_Rocce_(Louvre).jpg

Saint Anne with the Christ Child, the Virgin, and Saint John the Baptist by Hans Baldung Grien (c. 1511)

Courtesy National Gallery of Art, Washington
Source: http://www.nga.gov/purl/collection/artobject.html/46161

Madonna and Child with the Infant Saint John Attributed to Fernando Yáñez de la Almedina (c. 1505)

Courtesy National Gallery of Art, Washington

Source: https://www.nga.gov/collection/art-object-page.447.html