Lunacore has a neat tutorial on making skin look smooth but still quite natural with your Photoshop.
“In this tutorial I’m going to show you how to make skin look smooth. The technique itself is not complicated, but does require you to be patient and work slow and accurate. If you can meet these requirements, then it’s not going to be very difficult to see good results.”
Please visit Lunacore to see this tutorial
See also: Photoshop Tutorials