How to create skin texture like that http://tf3dm.com/3d-model/boy-10833.html. Is it just a single color with ambient occlusion map or is there more about it?
That? Looks just like a diffuse texture, I don’t see anything special from this preview distance.
I mean to get all the light and shadow areas do I need to paint it by hand or is adding ao map to basic single color texture enough?
It just looks like a diffuse material with a narrow light source hitting the front of it.
None of it seems to be texture painted.
It is just a single skin color with ao included. To get more vibrant color (No sss) , use vertex dirt map as factor and apply different skin colors (high and medium tones ) for better look.
you don’t need to paint anything by hand. A good skin color palette can be obtained from internet search as well.