Colored Pencil Portrait of Keira Knightley

Now it's finished, my colored pencil portrait of Keira Knightley. Here is the reference picture: http://raaniyork.files.wordpress.com/2013/09/keira-3-keira-knightley-25696898-1600-1200.jpg 

I had a hard time with these wax-based Prismacolor pencils. So I bought a small set of Faber-Castell Polychromos and I hope they're nicer. I've made so many mistakes - this was a try-and-error portrait. In the end I'm not so disappointed as I thought. Although I have to learn waaaaayyy more about portraits and colors and -- *sigh* everything.