Truth is, there's not a lot of information on making realistic humanoid puppet effects online. Or rather the quality of information that is available is of questionable pertinence.
I have learned how to make realistic human eyes out of acrylic and epoxy.
I have seen pictures of several eye mechanisms. Most of them look either flimsy and tacked together or machined and overbuilt. What I see in my mind is a lot like a ball held captive by some sort of ring, and as I move my trackball, I wonder why the idea seems so familiar.
See, I have the logitech MouseMan. It's basically a thumb-driven mousewheel, and the ball is about the diameter of a human eye...
I need to play with molding.
But first, a new boiler. And installing the dishwasher. Making a dolly. Fixing a roof.