>>3719877What kind of anger are you trying to convey? There's a difference between insulted, furious, cranky, irritated, suppressed rage, scorn, etc
In general, anger has furrowed eyebrows, plus intense-looking eyes (wide open, with smaller iris/pupil than usual and a lot of eye white visible is one way to achieve the "glare" look). The eyes could be squeezed or squinted too. Clenched teeth, or teeth bared in a snarl, are also a great sign of anger, along with shouting and tension in the body/face in general. Angry people can have wound-up or aggressive body language, may seem like they're barely holding themselves back from outright attacking somebody, and can lose self-control.
Different types of characters will express emotions differently, and there are also many degrees and variations of anger. Here's some more things to think about:
What type of emotion is anger? Think about how it feels when you're angry, like the physical sensation, how could you describe it without just saying "anger?" Is it jagged? Painful? burning? Cold?
How do you move when you're angry? Are you still, stiff, rigid, relaxed, or do you pace or fidget, do you throw something... what do you do, what do you say? How do the people you've known in your life look/act when they are angry? When a character in a movie gets angry, how can you tell? Keep that sort of thing in mind, and file these observations away in your head for reference.
Here's a chart that shows several of the most basic emotions at different intensities. Think about what makes anger look like anger, here. If they weren't labeled, how would you be able to tell which one was angry?
Also think about what makes anger look distinct from the other emotions.
And here's a link to a different chart that shows a ton of emotions and their iconic features, including anger, which you might find useful:
http://www.cedarseed.com/tuts/emotut.jpg 
