What Are People's Different Facial Expressions?

I'm assuming you mean what is the person thinking when they have a certain expression? Well, I'm pretty good at reading most people (EXCEPT my crush... Go figure), and if they are always looking down, with their eyes darting back and forth occasionally, they're upset about something, and possibly trying to hold back tears. If their eyebrows are raised and they're smiling really big, it usually means that they find something amusing. An unfocused, fixed look means that they're thinking about something and completely oblivious to everything around them, or else are watching a certain person and not realizing that that person is staring at them. An even face-- someone who isn't smiling or frowning-- usually means that they're thinking as well, or it could mean that they're trying not to care about what someone did or said. Slightly furrowed eyebrows and constantly looking around are signs that someone is disturbed by something, and is dwelling on it. Hope this helps!