Punk Girl (Anatomy Practice)

I meant to post this yesterday but it was late so I decided to wait until today.
I've been trying to practice anatomy more and so I've been looking at lots of tutorials lately.
It was just supposed to be a sketch of the figure but it came out so well I started
adding clothes and hair and turned it into a full picture.

Constructive criticism would be appreciated on this piece as I know it isn't perfect
and I want to improve my anatomy skills further.