You can add MouthPoint for your characters and add influence of this point, this is how youre becoming able to move head. Also you can make a character to look at specifical target. I advice you to look at their video dev log (
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), some functions are different now, but most of things are the same, also some explanation you can find here:
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For me it helped a lot, before reading and watching this, I had made kind of a horror scene
but then realized what have I done wrong.