TRSE: How To Draw Tutorials:
Emotions:

Glaring:
That "Don't mess with me!" glare on Taffe's face.

  That is the kind of glare used to keep the people away from a person.
 

  That's a type of glare displayed by Venus when she didn't like what Uranus said to her.
  Mars was glancing and glaring at the same time to show that she was not pleased with with Moon.
.
In Pain:
   The way eyes were shaped with tears can indict that a person had been pained/hurt. For example, Moon pricked her finger while trying to sew the pieces of clothing together.
  Michiru has that pained and confused look on her face because she has been yelled at.
"Me and my stupid clumsiness...." -Moon- 

  That was the reaction of Moon when she was running, and found herself tripping against a mail deposit box. The pain was usually steady/throbbing (not sharp) and lasts for some time.

  A type of  psychological pain being felt as if a heart had been stabbed by a knife/sword (or suddenly breaking of heart).
.
Confused/Puzzled:
Pluto gives you her puzzled look as if asking you a question.

  The puzzled look on her face is kind of a half-frown with a raised eyebrow. Some people cannot raise just one eyebrow, so they can manage only a weak frown with questioning eyes. That expression can be used to ask a question without using any words.

Another type of confused look resulting from encountering something very and unexpected.
.