Skin is painted.
First I painted the base color ( Bronze Flesh by Garage Kits- my new favorite :D )
Next I used Transparent Sienna Brown to add shadows.
and some extra shadows with pastels
As a finishing touch, I used Transparent Warm Additive to lightly spray a thin layer of paint over the whole skin area to level out the tone.
Sorry I don't have the pictures of the final step. They turned out too blurry :(