Thanks David.
Still far away from some of my ideas. But there's already an idea very deep in the back of my brain how to animate blinking eyes in Terragen... something for 2018-2019

In Facegen modeler you need as minimum the front view of the face. Optionally you can use right and left view. you must set some markers and the program does the rest. later you can modify the model.
The better and bigger the photos are, the better your object will be of course. And for better similarity to the original you'd better have at least one side view. The pictures should also have an equal illumination without hard shadows... not so easy to find. And side views of prominent people are even more seldom.
I used the front view and one sideview for J. Statham and front + left + right for James E. Olmos
Many possibilities - much to learn - and I'm still at the beginning ... again