The portraits have a pretty simple style because they're animated, so having dark shadows would look weird for extreme movements. Although I've learned that extreme animations are really hard to do anyway, so maybe we could have gone for a more detailed style...
But yeah here are a couple examples of different expressions at least so you can get the idea:
http://www.projectbc.net/wp-content/uploads/2016/05/db_1.jpg
http://www.projectbc.net/wp-content/uploads/2016/05/db_5.jpg (please note her head and body are at a different angle here; that was very annoying to set up)
http://www.projectbc.net/wp-content/uploads/2016/05/db_6.jpg (her head is tilted up, which was also annoying to do)
I wanna animate her going into a firing pose and folding her arms and stuff, but I think it's gonna be too hard and I'm just gonna have to get my artist to redraw the arms. :/