Jaz GO!

[Gors]

man, work on a darker background/canvas in future, it'll help with saturation and contrast.
i've made an edit to show how differently you could do your sprite, including your original (on which i edited a few outlines and the contrast and saturation and stuff)

scale of 1-6 facial expressivity
it all depends what result you're aiming for. i hope it gives you a better insight as to what you can do.

the last one is fucking hilarious