Understanding your character’s behaviour and why they react to events enables the reader to establish a connection with your character.
Body language isn’t just being able to tell off-the-bat that someone is lying. It is
about directing you onto the next action or line of questioning to take. Enabling you to ‘read the room’ more effectively. And portray your character and villains in a subtle way by using body language and facial expressions to suggest what they might be thinking.
Using the five senses to depict what your character is experiencing, and to ‘show’ rather than ‘tell’ what is going on.