I'd recommending either axing or enhancing the small features, like removing the mouth or making it bigger and more expressive. The hair, for example, doesn't really need all those colors in it because they wouldn't pass at a small scale. Make it bigger and bouncier, or scratch the complications.
Otherwise, I'd recommend changing the design a bit to add more color. Everything save the head is white, and making stuff like the arms for example a different color would help a viewer understand when it would move better.