First off; HOLY CRAP! My first reaction was amazement towards the colors and that hair! The hair is perfect and I love the color choice in this one paired with the texture from the paper and pastel. It makes a great impact even from a distance that draws the viewer in.
There's just a few things that I can see that could be improved. One is the skin color. The base color is beautiful and I can see the many different shades in the tone, but I feel like they could be amplified more. It could be the scan/photo taking away some of the color, though.
Next is the ear. It just looks really small.
That's all! Good work! I hope you make more like this!