Hi time, welcome to the community.
Those images have been 'air brushed' manually. There's no specific plugin or filter that will give you that effect.
Simply put... open the original photo and manually paint/brush over it.
There are a few tutes around that can help get on started learning this technique, but i don't recall the urls right now. I'll have a look around.
Hopefully someone else can point us to the urls... anyone else know?!
Perhaps check the PS Links board here too there may be something already posted there...?