Color, lighting, saturation, contrast, and many other factors all play in to taking a decent photo and making it fabulous. This assignment is to change the mood or tone of a photograph by altering the contrast, brightness, hue, saturation, exposure, etc. You do not have to change all of those things about the photo, but you can if you would like to. Experiment. Don’t be afraid to take it to the extremes, and don’t be afraid to be subtle. Familiarize yourself with your editing software, whether it’s Photoshop, GIMP, Picnik, or any number of other editing platforms. Most of all, enjoy what you are doing!