Beautiful! Simply beautiful!
How else could I describe this work of art? You've perfectly captured Luna's personality!
I love how aristocratic pony Luna looks and her human counterpart is no different. They both have an aura of authority and royalty around them both. Also Luna's expression demands respect, in a way. I'm not saying she looks snobby or anything. It's just that you made her look like a true princess to put it that way. I love her expression and I also love the dark colors you used. Her clothes... they add the finishing touches to her perfection. Great job!