the makeup artist on this set was great and had used a lot of heavy eye makeup and bold lips colors.. so no need to add that in post
for the most part the skin is a combination of masks..
generally i'll create a few layers.. blur 1 layer ALOT then create a negative mask.. and paint back in the blurred mask on the layer below.. with a semi opaque brush
once things are nice and smooth i'll select a color range of the lightest color on the skin and fill that in with a almost white color.. then blur that out quite a bit and duplicate the layer a few more times.. masking off areas that spill off of the subject..
its just a push and pull procedure til things start looking good
after that its a bit of liquify to get nice even lines / emphasis certain shapes..