Using gestures and facial expressions to influence audiences is an old art, extensively cultivated by the Greeks. These references to chironomia will answer many of your questions. In his chapter on the countenance alone, Gilbert collects observations from Cicero, Demosthenes, Aristotle, Pliny and others on the expression of the eyes, eyebrows, forehead, cheeks and mouth. But the study of gesture is most extensive and thorough. I'm fortunate to have a copy of the book.