okay, this kind of just sparked a thought that i needed to share.
I like this traffic light behaviour management chart because it helps students with self-regulation. When children are misbehaving or make a bad choice, they will move their peg down a level. They will also have the chance to move up a level if their behaviour improves during the day. At the end of the day, they could colour in a face in their agenda to go home, which also communicates with parents the kind of day that their child had at school.
This is the range of emotion and expression that is possible with the human face. This guy is moving - mouth, eyes, eyebrows. A great headshot technique is to throw out words and get your clients to make whatever face they want to convey that word. It doesn't have to make any sense, and a lot of times there's a genuine smile that comes right after making the silly face.