I have done some colorgrading in PS I think he looks to " healthy" at the moment for lack of a better word .
I also did some previz stuff to get a bit of a feel on how to progress, I especially like the nostril paintover this shouldn't be much trouble in Zbrush.
What will be quite the effort are the eyes these ones I photoshopped in from reference, but I really want to make them 3D, I know in the book he is depicted as having slits like a snake, but I agree with Ralph fiennes that some humanity still needs to be visible in order to engage the viewer with a character.

Previzing like this makes life a lot easier I can tell you , because when you have a plan progress tends to go a lot quicker versus diving right in to the meat and potatoes

Le me know what you guys think