Cut out the desired image from the paper napkin. Carefully take off the (obere Schicht) top layer and place it on the canvas.
(bügeln) Iron the image onto the canvas. Use a simple flat iron only, not a (Dampfbügeleisen) steam iron. (Instead of ironing the image onto the canvas, you can also apply another layer of napking glue to the image. Be very careful, however, as not to destroy the image.)