Good start! I'm not nearly as good at painted hair as a lot of the talents around here, but let me give you a couple/three tips: A pressure sensitive tablet and a program that actually works will with it, like Painter, is a big help, as you need to vary the with of the curls, get fine ends and stuff. Photoshop isn't especially good for this. Painter's "Just add water" is great for the carefull blending you have to do too, Photoshop's smudge doesn't cut it! Work in other colors, do hairs as darker lines, with ligher on top, to give you some detail in the body of the hair. Work in highlights on the curls the same way, and shadow detail. Think "hair, hair, hair, light and fluffy" as you work!