I recently found a nice free head bust model of an old man on Sketchfab. I made a texture to separate the shirt from the skin and applied a subsurface scattering material to the skin parts.
I then realized that the eyes were scanned as well and somehow looked dead. So I carefully cut out the faces where the eyes were and added my own eye models.
Then I created three hair simulations in 3ds Max (beard, peach fuzz and even nose hairs), meshed them and imported them into TG. I used another mesh for the lashes.
Making masks was a pain in the butt, since the texture wasn't the usual tidy one you can paint on, but a mess of fragments, almost like a puzzle. So I had to create my distribution masks by painting inside the viewport directly on the model.