Mona_Lisa,_by_Leonardo_da_Vinci,_from_C2RMF_retouched

da Vinci's Mona Lisa

Leonardo da Vinci, The Mona Lisa, or La Gioconda (Louvre Museum). This image is in the public domain in the United States because its copyright has expired. Courtesy of Wikimedia Commons: http://en.wikipedia.org/wiki/File:Mona_Lisa,_by_Leonardo_da_Vinci,_from_C2RMF_retouched.jpg