Kitsune (or some sort of Western fox spirit)? Wolf spirit? Catgirl? I'm leaning towards the latter since (as far as I can gather from my limited research) "Nekomimi" means "Cat Ears" in Japanese, but I'm curious.
seems more the snide, but caring big sister type...if shoulders were slightly more cocked would seem more natural and filled with attitude, thus more naturalistic. Good work, but you seem capable of much more than you show sometimes.