I agree with evaunit. You said sewing wasn't your strong point, and I think the judges saw that. Not saying it's not a good costume, but in the context of a competition, I think it needs some work. Yeah, lights are cool, but those alone shouldn't get you an award.
Tsumugi Kotobuki - Waitress Ver. [ K-ON! ] - 100%
Yuki Nagato - Disappearance Ver. [ The Disappearance of Haruhi Suzumiya ] - 100%
Lara Croft - Reboot Ver. [ Tomb Raider ] - 90%
Kyouko Sakura - Casual Ver. [ Puella Magi Madoka Magica ] - 100%
Makoto Sawatari [ Kanon ] - 100%
Charlotte - Human Ver. [ Puella Magi Madoka Magica ] - 40%
Ayu Tsukimiya [ Kanon ] - 10%