Playing Around With Facial Rigging

For my animation I will have many of these characters in the same room because the human race has long been void of any form of diversity. Instead humans are all clones. (convenient for someone who is lacking in time). I really want these characters to show emotion and sadness in losing their home planet. Because of this I need to produce a rig that is capable of delivering realistic emotion.

I have only completed half the RIG but here is some poses I have managed to produce using a simple joint structure in maya.