How in the world did they accomplish this? Was his face Photoshopped from scratch, using available visual references as guides, but ultimately improvising on the rest of the details?
I assumed it was a CG recreation of Hartnell's face, possibly derived from promo shots for Doctor Who
and other work like The Mouse that Roared
Which reminds me, on a totally tangential note. I've long thought that Hartnell's character in The Mouse that Roared is
the first Doctor, who has infiltrated Grand Fenwick to prevent Tully Bascombe from doing anything stupid with the Q-Bomb. Grand Fenwick would be the perfect setting for a Doctor Who