The Hunter Morlock was sculpted by both Joey Orosco and Hiroshi Katagiri. Here I did a couple of skin tones as well as different blood "war paint" patterns and hairstyles.
The Spy Morlock was sculpted by Hiroshi Katagiri and once again, I did two skin tones and a few hairstyles and clothing color variations. Here are two of them.
The Über Morlock maquette design had a larger, more prominent "brain" on his back than what it ended up as in the film. I believe it came across as too gruesome so it was scaled back. In my Photoshop design I added lots of realistic muscle and fat strands to its meaty look. Since no one was cast yet for the part, I just used a generic face.
Once Jeremy Irons was secured for the role of the Über Morlock, I used a photo of him to work on some looks for his skin and hair, The makeup and "back brain" ultimately went to another company and final look in the film was even more pale with nearly white skin, pure white hair and dark lips.
Below is a design for a "worker" Morlock whose character was not depicted in the final film.