Well done! One question, though: in the pumpkins depicting nightmare moon, the shadowbolts' logo, and bat-thing(?) how are the eyes staying up? There aren't attached to any part of the pumpkin... ahhhh, I'm probably over-thinking it.
Nice rendition of this scene. I like Luna's pose as well. I think she could have a little more light on her edges though and more contrasting shadows where the light isn't hitting, since the moon is such a huge light source behind her.