Girl sketch part I

Needed to get into drawing females again and while i was mindlessly browsing around the web i came across a colleague's site with pictures of her on it.
One pic stood out amongst the rest so i asked her if i was allowed to use it.
This is just a sketch i drew up, still not sure about lots of things like the pose, flow and background.
It's a start anyway ;), it'll be interesting to see what the development will be.

Sketch:




















Original photo: