After:
I chose a picture of my little sister and a picture of a slope from our ski trip and combined them. They were my own pictures. I manipulated it by cutting my sister out of the parking lot background that she originally had, putting her onto the slope picture, erasing all the shadows and a skier in the background, adding a lens flare, and saturating the color in both pictures to make it brighter.
My main reason for manipulating the picture was that it's such a cute photo of my sister but she was in an ugly parking lot background, so I basically just made it look better overall. I don't think the manipulation was harmful at all because it didn't change the way she actually looks, I just put her in a more aesthetically-pleasing setting.