Choosing a lens which will give you desired results for a particular portrait assignment is an integral part of being a photographer.
Portraits
5 Common Portrait Retouching Mistakes

The vast majority of portraits you shoot will involve at least a small degree of retouching to create a finished image, and there are a lot of places where things can go awry. This excellent video tutorial will show you five retouching mistakes portrait photographers make and how you can either fix them or avoid them completely.