I've done a draw-over on your last drawing to show my points. Beware, it was done with an online painting tool and a computer mouse.
[hider=Image][img=https://sketch.io/render/sketch543f06a89b300.png][/hider]
[hider=Image 2][img=https://sketch.io/render/sketch543f06f52d5e1.png][/hider]

Your pose is a bit awkward due to the weird angle of her left arm and hand (a fault Sherlock pointed me at in my last drawing). When trying to draw someone in a certain pose, always try to find references for it or getting someone (even yourself- to quickly pose for you. You easily have acces to someone doing said pose naturally, and basing yourself off of that adds a genuine feeling to it. 

Furthermore I would recommend delving further into the topic of anatomy. As you can see I left my sketches of the drawover (in red) still there so you have an idea of how I specifically use shortcuts to learn anatomy. Anatomy is the one thing that makes or breaks most if not every drawing of an organism that's intended to be at least semi-realistical, and still the bane of even artits like Sherlock. The only cure is lots of practice and references. A short summary of faults I immediately noticed: Her breasts were too low and had a really sphere-like shape, as if someone cut a ball in half and taped them to her ribcage. While in a front on drawing of a relaxed pose this is not too noticable, once movement is involved the breasts move along. (the same with breasts of men. I just watched myself in the mirror today, it's almost spooky how they can move if you pay attention to it.) Secondly, her arms, legs and middle were all too long. I can give you the advice when drawing without clear or with little references to use parts of the body you already drew to measure the parts you still have to draw. A good measuring unit for example is the head. 
Handy links: 
° http://farm2.static.flickr.com/1021/836560773_9dc73c2e2f.jpg
° http://illustrationage.files.wordpress.com/2013/04/andrew-loomis-figure-drawing-for-all-its-worth.pdf

Also, one of my own:

[hider=University Sketchies]
[img=http://th01.deviantart.net/fs71/PRE/i/2014/289/1/4/university_sketchies_19_by_roranhawkins-d832rve.jpg][/hider]