Very expressive, as if Supergirl's as confident as ever but at the same time there's a touch of apprehension, like she's unsure of what she's facing... perhaps a bit puzzled but trying to look determined. It's very subtle but visible. Great work!
I'd really like to see you acting these kinds of deeper emotions and thoughts, portraying the Girl of Steel in a variety of situations. Most cosplayers just do a simple pose but you seem to be able to capture a mood or a moment in time of something more going on.