Hi, do you want to take a look at my story on fimfiction.net Luna's Love? It is a Comedy with Slice of Life, not done, but cute, and has lot of drama, tragedy and love. It is also so funny, so you will laugh! My username is LunaPoland.
I love the contrast w/ Princess Luna's dark coat with the bright jewelry, very eye catching, yet, feels misplaced. I guess because the jewelry have the yellow theme of the sun, making it kinda weird for the Princess of the night to grab hold of them and vise-versa w/ Princess Celestia.
I cannot say Luna is best princess as so far Cadence is on my top list, and Twilight will have an appearance in season 4, but I can say that Celestia's golden regalia look far better on Luna, gold and night blue really fit together well.
Also, gold on this image is so flashy, incredible attention to detail just like Luna's mane.