Your costumes look great, Momoiru, I don't really know Naruto that well to particularly comment on them, but I think it would be of benefit to practice posing and facial expressions to pull you into character more. You look quite bored in a lot of photos, and in some others you look like you've pulled yourself into a pose for the photo, instead of moving into it naturally.
If that makes any sense. o.O
Practising in front of a mirror is a bit dorky, but totally worth it, especially if you're at a con and don't have a photographer directing you.