Ideally, you should create new sets to place the layers in, but since everyone doesn't have that capability, I'm doing this without the use of sets.Working on the Moss pic as the background layer, duplicate it. This way you still have your original pic in case something goes wrong (which it does). After duplicating it, desaturate the layer which will remove all color tones and it will look like this.In order to add the marble, you first must make a selection of the Moss pic. I like to use the pen tool to make certain selections (if you have a Wacom tablet, it makes this much easier). Once the path is closed, I save it in the path palette by double clicking it and renaming it. Once it's saved, and the path still selected in the palette, i continue to add to the path by drawing a path around the areas above the shoulders and inside the thumbs, so i have a complete path outlined of Kate and it should look like this with the path visible.