Your doing alot of things really well, but work on your anatomy. arms are typically not that large on women, the heads too small and the wrong shape, the neck is ridiculously stiff, finger size is also not consistent.
It's hard to tell because of the style your doing, but you need to control whether the lines that construct the body are rigid or curved better, this distorts the muscles in the arms an hands.
In posing remember if the perspective on the hand is dramatic the perspective on the rest of the body needs to be dramatic as well(i.e legs and left hand need more perspective distortion).
That's just a quickie so forgive me if any of that is unfair but i'm in a hurry ;P