I chose this because its a typical senior photo touch up job. They obviously adjusted the levels as well as some photoshopping on her face. Seeing as they're pretty minor changes, I think it's find to do things like this for portraits.
Learn to edit a portrait image in Photoshop Watch as we edit a photo starting in Adobe Camera Raw, cleaning up tones and exposures as well as cloning and highlighting areas. Part Editing in ACR (Adobe Camera Raw) Sharpening tips Exposure Correction Bum