Well, I disagree with your whole "they don't portray any emotion" statement.
My only advise is, watch more anime; there are different art styles, made by different people at different time periods, using different technologies. Saying all of anime does not portray emotion is like saying all of live action is boring; its generalising and is just begging for a Quibble Pants to pop up and throw a list of examples that they feel dispels your theory in a manner that may upset you.