Basic skin retouching using frequency separation and dodging & burning. I use this process on every photo that I do, and I usually spend about 4-5 minutes on headshots like this (and less time on full body shots when there is obviously less detail in the face). This is not intended to be a high-end retouching tutorial - but techniques that can help people who want to do natural-looking retouching while maintaining most of the natural skin texture!
Here is the final photo - http://www.flickr.com/photos/xosara/6122295521/
The final editing was done with one of my Photoshop actions, available at http://www.sarakiesling.com/actions :)
30 Funny Photoshop manipulation works for your inspiration
30 Best Photoshopped Images and Creative Photo Manipulations