Awh! Kousagi all grown up! Her hair for the most part is well done because her hair is more curly, but she only has two buns on each side of her head and they are a bit more cone shaped then Chibiusa's because it's supposed to resemble "catlike and rabbit-like earts" but it looks nicer the way you did it ^^
Her eyes are blue like Usagi, but her hair is actually a softer pink, but a bit more cherry colored the Chibiusa's. There is only one known color picture of her and sadly it's just a photo-bust Naoko colored :c so we never got to see the color of her Sailor uniform, but she does have a set hair and eye color scheme of her own that is canon c:
If anything this reminds me of a grown Diana, as Luna's human form was based off of Usagi's face and body type. Diana's hair is a light grayish purple, she has four buns, no tendrils but I guess she could grow her hair out c: and her eyes are blue c:
It's funny cause in the anime Luna's eyes are red, Artemis is blue and so is Diana's but in the manga, Luna's eyes are often either blue or red, Artemis has green eyes, and diana's eyes are blue or sometimes gray ^^
Fanart there isn't much sadly but there are quite a few websites with information about her and certain websites you an read the manga short on her. It was a cute lil story, Parallel Moon, have you read it? If you have google translator I'd check out the Sailor Moon official website, Sailor Moon Channel for more information.
The only thing left for guesses is the coloring of her fuku, but her hair, eyes and skin tone are based of a colored picture of her Naoko Takeuchi made of her in a cute lil pink sundress. Her ktty partner is also like a bubble gum pink with lighter spots.
Fanart of her has changed her colors vastly, but I would stick to the original version. Her hair also has spikier buns and she only has two spokes on each head, but here you've drawn her with four on each side.
Here is some of the information on the characters.
Hola~! Estaba investigando sobre esto (porque nunca había escuchado de este personaje); y en esta página [link] dice que es un personaje que aparece en una historia paralela que salió en el sexto y último artbook de Naoko, ergo, no oficial, pero sí original. (todo depende de a qué le llame uno oficial) Saludos~
De echo si sabía de este personaje, es la segunda hija de Serena. Pero no existe en la línea temporal del manga. A eso me refería con que no es oficial, mas nunca mencioné que no fuse original pues fue dibujada por la misma Naoko Takeuchi.