Hey! Found you via /r/cosplaygirls .. I do loads of cosplay photography too.
Firstly I wanna say that this is a crazy good shot! But there's something you gotta be careful of. You're not saving your files correctly. If you use Photoshop the easiest way to do it the right way is through the Save to Web option. That way the colour profile converts correctly.
That is why, right now in the thumbnail or the resized version.. the photo is insanely desaturated.