I've just started to look hard at acting in animation and heres a tip I picked up from Keith Lango. Again I fully recommentd him. He will raise your game.
1st What are the internal Realities for this character at this moment at this time and place?
(Ask yourself? What does this character need right now, what do they not have?)
2ndHow do they feel about it? What is their Emotional Reaction to it?
(Why can’t they have it?)
(Example: If you’re an attention seeker and nobody paying attention to you
= You want or need attention and you’re not getting it.
What are your emotional reactions?
= ANGER, FRUSTRATION, LONELY, UPSET, ETC.
Animation is: The outward expression of internal realties of our characters.