You can't just tell actors, especially young ones, to 'act happy' and expect them to do it. They must in some essential way be happy.
Roger EbertThere are often lists of the great living male movie stars. How often do you see the name of Nicolas Cage? He should always be up there. He's daring and fearless in his choice of roles, and unafraid to crawl out on a limb, saw it off and remain suspended in air.
Roger EbertIn the vast majority of movies, everything is done for the audience. We are cued to laugh or cry, be frightened or relieved; Hitchcock called the movies a machine for causing emotions in the audience. Bresson (and Ozu) take a different approach. They regard, and ask us to regard along with them, and to arrive at conclusions about their characters that are our own. This is the cinema of empathy.
Roger Ebert