I have never had trouble with any actor being able to visualise things. They are amazing. As long as you have your monster head on a long stick, so you can hold it up there and you can wave it around and let them see it and explain it to them, they are just great.
Other times you can get showy for three minutes, and that's OK with certain films. But that isn't right with an Ang Lee movie, you have to fit right in. You have to understand Ang, respect him and be part of the team and not be in charge of it - he is in charge of it.