Id have done something more exciting with the hair. The "power" colours are red, black and white, so I would have used them more. I think Id have done her hair dyed bright red.
However, as she is an Aryian super babe I guess blonde is more approriate! It could do with brightening up a notch or two though. I would go over with a drybrush in white, followed by a glaze in yellow. Oh, by glaze I mean a wash. With a wash you let the paint, usually a darker tone, settle in the crevices. With a glaze you use a neutral or bright colour and spread it thinly and evenly over the surface of the model. YOu dont let it settle in the recesses and so it enlivens all the colours underneath.
Glazes are a great way to do yellow and reds. I often find that reds and yellows turn out too white or pinky, so a glaze reinforces the base colour without ruining all the tonal work you have already done.