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The Clone Stamp tool is a fantastic aid when retouching. It can copy areas of your image to other places, just by Opt/Alt-clicking before you brush. For creative purposes you can clone from one document to the next. Open a collection of reference images, and using the Photo Bin at the bottom of the screen, flick between them and your project, Opt/Alt-clicking on various textures before applying them to your picture.
You can build up compositions this way, rather like masking, except you don’t have to position anything: you simply brush wherever you want the effect to be placed.