more photoshop based question

There are many, many techniques, some are quick & simple and some are very least for PS amatures like me.

Google "Photohop Skin" That should give you a few hundred thousand places to start. ;)
The first couple look like fairly basic level and colour alterations...

The last 2 look like there's a bit more work gone into them - looks like some airbrushing and softening, as well as altering the colours / saturation / levels...

But as Big Mike says, Google it for more in-depth techniques :)
There are a lot of different ways to get that airbrushed look. It can be as easy as using the surface blur filter in CS2.

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