Moonbutt is glorious. Love the back-leg armor, while still potentially weak to arrows it just looks incredibly detailed.
Also, could you have given her any more of a shapely derriere? Those wings and gorgeous. @_@ I need to watch that video of you doing this.
Possibly been pointed out a million times, but its probably why I like this one more so, is this is actually Luna before she turned fully into Nightmare Moon perhaps? She hasn't inverted her colors completely yet it seems. Though, this could of been her form all a long before she lost her true powers from the elements long ago for all we know (s4 animatic not into account.)
Old piece, but never really took the time to really admire it. That ghostly visage of a face would be enough to make most of Equestria's strongest curl into a ball and whimper like a new born pup.