Winter in Venice

I've been leading photo workshops to Venice since 2006, and only one time have I seen enough snowfall to stay on the ground without quickly melting. Unfortunately, no costumed models were out. It wasn't the cold that kept them from posing for photographer; it was the melting of the snow on fabric and feathers that would damage their expensive, handmade costumes. In San Marco Square, there wasn't a soul out at all. So, in Photoshop II opened an image of a costumed couple in a romantic embrace, selected the two subjects using the pen tool (which creates the most precise selection possible), and then pasted that into the wintry background of Venice. I then used the burn tool to add shadows beneath their shoes. Everything casts a shadow, even in diffused light.