I'll have to look into that book.
I managed to attempt a live portrait although didnt get very far.
It took 2 and a half months to find a model-and by the time someone actually was serious about showing up I had abandoned the idea--but then to my surprise they actually did appear. A professional model.
I think I talked too much while attempting to make the head in 1/4th scale.
Then I took some photos to do the head later.
I didnt take enough photos.
She had enough model photos for me to work from-though I had to factor in age-since some of her photos were from her teen years and her nose grew!
I was disappointed with the process. The final sculpture was decent, but my eyes weren't trustworthy-I kept having to adjust the upper eyelids and mouth.