http://www.camerareviewlabs.com/debates/to-touch-up-or-to-not-a-very-good-question/

The question all photographers should ask. And the answer is important. Touching up every photo just just for the sake of doing so is now the norm. Older photographers (and yes I one of them) prefer to capture the image correctly ‘in camera’ but there are times when an image will benefit from a simple crop, levels adjustment etc but over doing it can ruin the image.