If you're not sure what you're doing to an image, or you really want to experiment, I recommend that you duplicate the image first. This is an easy way to create a safe copy. Now, you always have the ability to revert the photo, but duplicating the image gives you a safety net, and allows you to go ahead, and experiment. To duplicate, just press Command+D, and you can make as many copies as you want. This now gives you the flexibility to tweak the image, making completely different looks.
Notice here, back in our library, all three versions happily coexist.
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