Photo retouching isn't easy. You have to make a person simply look better, without adding any unrealistic effects. The result must always be realistic and it should be hard to tell what you have done to the picture. It's very sinful.
This tutorial will teach us how to use the clone tool to change the shape of the pupil of an eye. This tutorial will work best in CS3, but is possible to achieve just as good results in PS 7 - CS2.