I'm learning a new trick now...
One difference between the real and fictional faces I've noticed is the shiny reflection areas on a real face as opposed to the otherwise flat looking fictionals...
And, the 'shiny' option in FaceGen makes such a bright shine as to make the head look unreal...
Finally I realized that I can use that FaceGen shiny face image as a semi-transparent overlay on the face without and shine to it and adjust the level of opacity of the covering layer to produce a (hopefully) realistic shine.
Of course, that will mean another group of considerations to possibly take into account when setting the lighting..LOL..
Fortunately, I will be able to set up an automated process to import the shine to the face with one click. Now, I just have to decide on the opacity and blend type...I'm leaning toward using luminosity blend only with about a 22% opacity....here's the before and after comparison of my first attempt at this (there's a couple of other candidates I have for blend mode too...maybe I'll vary the modes depending on what looks good for each face and on what promotes variety):