[windrider86]

First thing you have going for you is that you have a wonderful model to work with.
Always step back and look at your entire layout. One of the first things I noticed was her arm is gone! Try posing her with her hand on her hip and her elbow higher up in the air. Sometimes poses seem very unnatural but when preseneted correctly they look very natural.
She's also lying at a tilt and somewhat in a "hole" trying using a more flat surface.
Watch your edges. Her feet are cut off as well as her elbow and part of the background is showing on the one side.
As far as giving technical advice on settings, I am terrible at that so will leave that part of to the master.
In your post processing tho you can sharpen up your images by using the unsharp mask feature or by using a hard pass layer with the blend mode set to overlay