Ava Picasso:
21-year-old hispanic fighter pilot. Black hair, built like an athlete, very high-energy personality.
Hairstyle reference: http://i.imgur.com/c6P1GnC.jpg

Expressions:
Neutral smile.
The face of someone who has just told a terrible joke and is waiting for her audience to either laugh or groan.
The face of somebody who has had a few too many drinks and is trying, and failing, to concentrate on something.
Bewildered disbelief - a face that says "are you fucking serious?"
Angry glare.
A confident thumbs up.
Soft, nostalgic smile, slightly lost in thought.
Barely-stifled laughter.
The kind of big, satisfied eyes-closed smile that follows either a huge, delicious meal or crushing all of your enemies.
Pondering a complex idea, when not especially accustomed to the act of pondering complex ideas.