La Belle Jardinière by Raphael in the Louvre, Paris. Once I started traveling and seeing art in person many artists rose in my estimiation and others fell. Raphal rose quite a bit.

https://en.wikipedia.org/wiki/La_belle_jardini%C3%A8re

https://en.wikipedia.org/wiki/Raphael

http://www.louvre.fr/en

https://en.wikipedia.org/wiki/Louvre