Here's a mechanical head I put together for a stop mo character. It can look right to left, blink, open it's jaws and rotate it's head. It could have easily been modified for cable articulation on a live action shoot. I did research on making eyes and found out that "glass eyes" that they use for people are not round, they are a dish shaped prosthetic eye like the one shown here. Through trial and error I found a way to mold a round eye shape then cast it in acrylic then polish it on a buffer. The iris and pupil were hand panted with oil paints and I used fibers from a red silk cloth for the veins.