Creating and developing every little thing characters do in your stories is, although rewarding, very exhausting. As screenwriters, we have to take this task one step further and write the characters’ actions in such a way that they can be understood so they can be converted to images and actions performed. Long story short, show don’t tell. The author, Amanda Patterson, also provides within the article a “cheat sheet for writing body language” and “five simple ways to describe characters”.
Check out the full article: 60 Things for Your Characters to do When They Talk or Think