David Moyes is the current Manager of Football Club Everton in Liverpool. This particular facial expression (note tongue, eyes, brow and forehead) is highly characteristic with intense focused effort - often but not always a physical effort - and concentration. As a Manager, Mr. Moyes is on the sidelines in this photo and his concentration is directed at his team. Since he is a former player though, this display demonstrates the physical empathy he feels toward his players' efforts. It's fascinating when you see this displayed by a member of a jury.