Nightmare Moon: Savior of Equestria

Ahhhh, finally done! This took me forever! This is an entry for the Twist Fate contest, it shows Nightmare Moon using the Elements of Harmony to defeat a corrupted Celestia. The only way Luna could grow more powerful to stop her sister was by turning into Nightmare Moon, thus making Nightmare the hero instead of Celestia.(btw, that's a lunar eclipse in the background) Enjoy!   

EDIT: I have added shading! I apologize if its no very good, shading is not my strong suit.