It is vey hard for me to give technical explanations of what i want in english since my vocabulary isn't widespread enough, just try to understand me. I like how you are doing it, but:
1) the mouth is too large and not enough opened, i would like to see the red teeths and the black space between them.
2) the eyes are too much horizontal, they should be more like \ / (Look at the first image)
Basically i want the face to be more lenghtened/elongated
For the rest (colors, proportions) it's perfect