On raw wood apply real turpentine, not substitute onto the wood, enough for the surface to stay wet with turpentine. Slide the wet decal off the backing paper onto the wet turpentine and carefully sooth out any air bubbles and then leave alone overnight.
The turpentine will melt the carrying film into the wood. If the next day you have any bubbles burst them with a fine needle then apply a coat of real turpentine over the image and leave again. When completely dry apply any oil based varnish to the image to seal and make it transparent to show the wood.
No glue is needed.