This looks really good. I think that you nailed the saturation of colors here, which aided in the overall contrast and composition. She looks very smooth, yet bold. Shading human skin (specifically Caucasian skin) has been a pain for me lately, but you've nailed it here, especially with the subtle touches of red around the ears and nose. Good work.

Love it, what software are you painting these in? Brushes look pretty sick. Keep it up!