Auguste Rodin - The Kiss (Le Baiser). One of my faves at the Rodin Museum.
Edvard Munch, "The Kiss," 1896-1897.
The Kiss, c.1907 (detail), by Gustav Klimt
Moment to Live For: The End of a War. The Kiss that Signaled the End of World War II: WW2 Photography by Alfred Eisenstaedt and the Famous Kiss Picture
Also we need some Klimt on the wall in the cafe? Or she can be looking at a Klimt painting further into the set, that could be cool too. More
"Le baiser de l'hôtel de ville" de Robert Doisneau -1950- Sometimes, I wish I can tell you I miss you so much, and how much I wanna see you and kiss you like this
Gustav Klimt: The Kiss (detail) (i found it on http://megeveryday.tumblr.com/)
A remake of Gustav Klimt's 'The Kiss', by Claudia Veja
Francesco Hayez, The Kiss (Pinacoteca di Brera, Milano)