Print or copy photos on to translucent paper. We used 100 percent cotton fiber Vellum Tracing Paper from Alvin, available at art stores. Kinko's copy centers also have a transparent paper and can print large scale copies.
Thin paste with warm water to the thickness of syrup. We used a great water-based, nontoxic, acid-free paste called Yes! Paint lightly on the back of the transparent print.
Position print and smooth quickly with your hands. Always work from the center of the picture out to the edge. Using the flat edge of an old computer diskette, smooth the air bubbles out from the center to the edge.