Well you definitely achieved your goal. I've always loved the "photobooth style" expression captures. They are utterly candid, even when you're posing, because it takes shot of life-as-it's-happening. There's no better or more fun way of working out a character's face and range of expression than that.
You should totally do more! You can always do something just a little different with each shot, whether you're only changing the line of the mouth or the slant of a brow, or what have you. It's those smallest details that puts the emotion in a face.
Charles, you've given Kevin Maguire and Adam Hughes a run for their money with these facial expressions. I think it's especially impressive that you've given Harley such a sexiness here just with her face.