I agree with France & ernyoka. People whoa are angry tend to keep their eyes open (think "GLARE!!")... Skin around the eyes (ie the facial muscles above and below the eyes) scrunched up a lot (vertically), but eyelids as open as possible.... It's a similar thing with the mouth. Jaw clenched; teeth together; but lips apart (you're almost there with that). If you can do it, some tendons standing out on the neck.. And looking directly into the camera. (he wants to kill something but is holding back..) Just my 0.2 worth.... Cheers, Diolma