Skin Shading - Looking for critique

[Anonymous]

Hey folks, right now I'm working on creating a hyper-realistic render of a friend. I started with a scan and the face texture.

My setup right now is: Diffuse plugged in with texture from scan and presets on Subsurface Scattering. I created a spec and displacement maps.

I'm planning to create individual maps for the Epidermal and Subdermal. But still in the process of figuring out the best coloring for that, any ideas?

I'm looking for harsh critique, I want this skin shader to look as real as possible. Thank you

Here is the render - 

Reference -

[damaggio]

Have you seen Tojek's set up?....https://www.youtube.com/watch?v=nf7B7anq2TQ