Alright, let's work on some anatomy on this picture. Again, if I screw up, someone show me up so i'm not teaching bad stuff.
1. Balance. In real life, to stay upright, a person needs to have balance. If you lean over to the left or right you gotta stick your foot out to catch yourself or you will fall over. This means that in a picture if your lady is leaning out to the left, she better have something keeping her from falling down or the person looking at the picture will get the impression she is falling over. The line with the circled 1 shows you the center of balance in this photo. You should keep in mind that 1/2 the weight should be on one side of this line, and 1/2 on the other. To me it looks like to balance out the forward lean on her torso you've done three things:
A) make her ass huge. Having a dress is an easy way to help draw a character- you can hide hard-to-draw legs, and add material here and there to help with balance. But the most important thing about doing a dress is that there ARE legs underneath that dress. Unless you are doing a victorian era dress that balloons out like crazy, the dress will generally conform to at least one leg- especially in the wind. SInce it just drapes down, any place where it bulges out should mean there is something UNDER the dress that's pushing it outwards. A good excersize to try is draw the legs lightly under the girl even though you are doing a dress, and then erase the legs once you've done the dress.
B) Added material on the left side of the dress as a "prop" for the girl. The problem with this is that the added material is just that, material. It won't hold the girl up, and it is hard to imagine a leg that would bend unnaturally to hold the girl up.
C) Chains at the top of the picture. The problem with adding the chain is that it's only holding up her arm. A single chain would twist the torso if weight was placed on it, and her arm would probably be more behind her than directly in front of her.
The best thing you could do with this picture is have the girl stand upright. The line labelled 2 is the angle of the torso. bring it back up to 90 * or close to it. Another thing that would help is looking at pictures of *mostly* or fully naked people in profile view, so you can see the spinal column is curved, not a straight line. Also in action shots, the torso itself can bend quite a bit and it adds smoothness to the drawing.
2. Arms. The further arm is a fair amount larger than the nearer one. This is lacking proportion- the arms should have roughly equal length, or the farther one should be a little smaller, as it is farther away. (close bojects =bigger, far away=smaller) And second, by the shoulder of the further arm you are missing some muscle. the area marked in blue is where the shoulder should be, and so her black dress thing should be up a little higher. Hands are difficult to learn to draw (took me some time) so it's best to start drawing a few on their own froma tutorial then drawing your own hands.
3. The head! The yellow line is the angle of her head. If you ever wonder if the person you draw looks unnatural, try his/her pose yourself and see how it feels. if you would like her to remain looking up, bring her chin in a bit, then up. You'll have to draw the underside of her chin/jaw however. The yellow circle is the cheekbone. You can tone it downa bit and get the same effect you were going for i believe.
4. Background. I love the upper clouds and moon, but i'm not really sure what the swirly black stuff is. A good background will add a lot to the quality of your drawing.