Utau Design Critique

[Lunailegends]

I made sister yin yang Utaus (that I think may have been inspired by Meaw but I don't remember if I made it before or after hearing about them) and I need a design critique on them. These are not my first Utaus I have another one called Kirakira but I haven't finished coloring her yet. So far I have 3 Utaus. I plan on giving the black one my normal voice and the white one my soft voice. You can hear what my voice sounds here: soundcloud.com/djkururu I want a real critique please.

Here's the char. designs:

Please do not use my characters or my artwork without permission.

 

[Info-Chan]

It's kind of hard to see what the designs exactly look like. If you want a full critique it would be best to post concept art, colored or not.