I'm seriously freaking out, that is beautiful! There's so few LoL cosplayers out there,and I'm happy someone is bringing this champ to life!
My only nitpick is that the white lines are a bit too harsh. Syndra's armor has very dark silver accents, and purple straps. So I think if you painted the lines a gunmetal it'll feel less costumey and more like armor/clothing. Plus the accuracy will make any LoL player cry tears of joy.