I like that smile, it's just free of venom (no pun intented). It's also weird humanoid snake, as in it just has long neck and skin, without the tounge or fangs. From what I remember snakes also have different skin color on "belly", if you could call that, and here lacking it too, she just looks like a lizard, altough not bad looking one. I also like the very limited color scheme.
Good luck with school.