http://www.garylandphotography.com/ http://www.sachawaldman.com/portfolio.html http://www.fiscusphoto.com/
These are some of the best post-production based photographers around. 50/50 photography, retouching. There's no one-click, or plug that will give you any of that. And then its just using your visual imagination, and be prepared for labor intensive work. Each one of those images probably represents at least 25 hours + work.
As a retoucher you are only as good as your source material. Never waste time working on a poor starting point. You find that at soon as you have great source material, your work leaps into a different category pretty quickly. What mainly separates good from bad in retouching is good, bad source material. Its a privilege to have a great starting point, people when they have been doing it a few years forget that.