Female figure.....kinda

I have a file on my computer of references I found online and I really loved the pose this girl was in and soon realized just because I liked it does not mean I can do it.  I am not sure if I am biting off more then I could chew trying to draw full scale figures but I don't feel like I am too far off.

I know just by looking at this I really really need to work on proportions and making my lines a bit more precise.  With a bit more practice hopefully I can fix my mistakes