Once the path is done, import the marble pic (or just drag the background layer of the marble pic onto the Kate Moss pic) and place the layer above the desaturated layer. Create a layer mask on the marble, command click the saved path in the palette which makes a selection, inverse it, and fill with black and you get this:Change the layer mode of the marble to Multiply. Adjust the opacity of the layer till it looks right to you. In this case I set it to 87% and it now looks like this: