As I won't actually be animating this character, for the sake of this unit and time management, I stuck to a small set of facial expressions that I would be using for Cornelius. I also made blend shapes for his eyelids, so he could open and shut his eyes.
Here is Cornelius with all the facial expressions that he is capable of.
In order to control Cornelius' facial expressions, I just need to control the blend shapes either with the slider in the Blend Shape window, or by creating driver keys. Cornelius is starting to resemble the Hindu god, Brahma a bit too much, so I shall simply add all of the blend shapes to a layer which I will lock and make invisible, of course keeping the original head visible and in its own layer.
Next, I need to do Cornelius' rigging!