This is by far the BEST picture of Princess Luna that I have EVER seen. The detail on her wings is extravagantly done. Her mane and tail looks ethereal and yet so realistic. She has her characterized stoic expression and just by the picture she radiates authority. Her magic aura is very well done as well.
But now to the most outstanding features. Her necklace is very well accented with a perfectly polished look. And her eyes. Her eyes. Once I looked onto them I couldn't look away. With them you can quite literally see the celestial body of which she is named for and she controls. This is absolutely beautiful.