Ok, I did two drawovers here. In both of them I changed the degree of rotation of the head since I think turning the head slightly would really relax the whole pose.
The first one is looking at her from a fairly straight on angle, going with what you've got:

One point to be careful of is the leg supporting her weight. Whenever a limb is supporting the weight, it should be in a straight line from the head to the ground, or the person'll look unstable. That leg should also be locked since she's in heels, which means she's standing on her toes (which locks the knee).
Another thing to be careful of is the arm in the background. Just because we don't see the shoulder it's attached to doesn't mean it's there. Think about where it's growing out of when you're deciding how long/where it should be.
Second drawover is going with what you told drunken about a low angle. This wasn't very easy for me and I'm sure Goshu could whip the pants off me in a ladies from low angles competition, but hopefully you can get my idea:

Halfassed the shoe, sorry, don't know anything about high heels
sweatdrop Again her supporting leg is right under her, but as things get nearer to us they get bigger and overlap the things behind them.
A few of the most telling areas are the breasts, buttocks, the forearm overlapping the upper arm, and the bottom of the shoes. We're looking up at these things so we're seeing a surface we don't usually from front-on or the side.
I'm not gonna lie though, drawing the second one was kind of a sonofabitch and if you take it on it's going to be difficult, especially if you're not so confident about thinking of shapes in 3d space.
I really reccommend when you're choosing poses and such that you draw a teensy, no-detail thumbnail sketch of the pose you want, just to figure out how the body shape is going to look. You do it small and with no detail so it doesn't take forever and you can quickly draw more if the first one doesn't look right. That way you don't spend 10 hours on something and then realize it looked really odd from the beginning. Doing little thumbnails like that can save a lot of frustration
lol Really hope that helps, be sure to ask if you want me to explain something better. And don't mind my mistakes, lol.