I like the active, dynamic composition you're going for. You might consider moving her sister more to the right so that she's more cropped by the right side of the canvas: Right now it feels very much like a two figure composition, but we really want the focus to be on a single main character, so perhaps moving the opponent off screen a bit will help make your main character a bit more of the focus. Another idea to do that would be to add more lines of energy (like your earlier compositions) with the lines pointing back towards the Angel of Light to draw the eye to her more.
Anyhow, just some random ideas. Good luck whichever way you go!