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I enjoy skin retouching, so for practice I'll do a Google image search for "acne" or "bad skin" and then play Photoshop Dermatologist to see how well I can clean up the images. You could also look at classic movie posters or music album covers and see if you can reproduce them. (I recently did my own version of the Beatles' Sgt. Pepper cover using a mix of celebrity photos and my personal friends.)  And speaking of posters, I would recommend a book called How Posters Work, by Ellen Lupton. It contains several brief essays on poster design principles, as well as about 300 illustrations of terrific posters from the Cooper Hewitt Smithsonian Design Museum that you could try to re-create yourself in Photoshop.