Oh may God, I wonder if it's not an optical illusion, if my brain has not decided to see mini-canyons where these are more mini-mountains  

I mean:

My setup has two lights on the left, one on the front and one the back.
Below, both tries were made using hborre's solution as I'm still not sure if the original displacement map isn't totally aligned with the veins...

I've just exaggerated the displacement value (note that it doesn't seem to be units dependent, contrary to to the SSS radius values)

Lit from behind:

Lit from the front:

Honestly: my impression is that my brain is "seeing wrong".  

If I'll use that package again, that'll be without displacement. I wonder if that's clear enough and I'm thinking to a small video I saw, in which the face of a known personality was turning slowly from right to left and vice-versa: I was unable to decide definitely if it was concave or convex

𝒫𝒽𝓎𝓁

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