Nice job! You've got some nice composition and vibrant colors here.
As a cosplayer, I'd be pretty happy getting these back from a big general gathering.
In a couple cases (the first three) you come dangerously close to cutting off the top of the model's head, or you do cut it off ever so slightly. Just zoom out a tiiiiiny bit or take a step back to solve that problem! I think it's fine in the 4th and 5th shots, because the cropping for the facial expressions is intentional. I really like the composition on the last two, and the first shot as well. Shot #2 might be improved by shifting the model a little more to one side of the frame.
Another thing is the focus, though it might also be camera shake-- your two inside shots are a little blurry (Makoto's hand, Rei's chin, etc). Make sure your focus is correct, and hold your camera in a way that helps reduce shaking (for example, upper arm tight to your side). Sometimes it's a cool effect, but in this case it's affecting important parts of the model.