Maybe you could get rid of the "branch" and enlarge the white one, put her on the belly area and have her refracting into the colors (that are above boob level, more on the chest area).
I like this a lot as well. I like that you have slightly different hair for each color. I like it as is, just on a different color shirt to make the colors pop.
Flying V has a great idea as well with the refraction.
It's sort of a trade off between the colored hair (better on the light blue) and the white hair (better on the dark), but I like the light blue better. maybe go for an intermediate color that would complement both?
The problem with the intermediate colors is that I kept losing one hair color or another. It seems like there was something wrong with every color but the dark gray.