Oh don't put yourself down, the hair looks very good! The only thing I would like to add is that the hair looks so glossy that it looks a bit like a glass wig! I'm sure that if you add deeper colors in certain spots (top of the head, etc) it'll look fabulous.
No, you did a good job, I really like it. Especially how it subtly changes shade of color a bit at the tips. The linart is nice, the shading is good, and the design is really cool. All around, you have uploaded a good piece of art. allow me to fav this. X3 *Clicks fav button*