image in post 12 is impressive IMVHO, but one should try to match neck and head tex, increase the smoothing node/parameter and increase the line width node/parameter. In addition, I'm guessing the eyes are trouble spots (transparency fx for lashes, brows, cornea et al.) I realise y'all can't post screen shots of Olivier's materials set-up, but it's imperative that you have control over variables like that.