The pelvis, I believe, is small, because she lacks hips. look at reference photos of women and note the curve of the silhouette. She's the width of her head pretty much all the way down. The clothing reads as pants because of the sharp divide between the legs.
[Sorry for my bad english]
It is a dress, i thought that it can be recognized.
The ribcage is really small, I realized it, but I think pelvis is like a normal.
Banding - will be fixed.
Coloring - I know, I wanted to make an effect with all "mistakes" you said, including sleeves.
Shadow - will be fixed.
Is this a dress, or big-legged pants? The torso is really tiny here, the ribcage and pelvis don’t have the volume they should. There’s banding on the boobs, and the shading should be primarily on the undersides of the breasts and not the sides, if your light source is from directly above. The colors used for te skin are a little dull, and the colors on the figure in general need more contrast (and more consistent use of highlights) to make the figure ‘pop’. It took a second for me to realize the ends of the sleeves were whats encircling the hands, I'd have the hands break that barrier rather than follow the same contour, having them in front of the sleeves will make it easier to read. A drop shadow would help to tie the figure to the ground she's standing on.
Edit
You should be getting more out of your palette. By that I mean that you need a better rang of values (higher contrast). The shadow beneath her is far too light, and the values of her cloak are also too close in value. The woman and the background are collectively too dark, and so she blends into the background. This is why I lightened the background a bit. If this is a dress she’s wearing, bear in mind you’re depicting a single piece of cloth. What you’ve drawn is a distinct separation that reads as pant legs. Your light source seems to be applied only to a few small areas, and also comes from different directions. Choose one direction, and think about how the light will hit the 3d forms that the woman consists of. If it’s from above: tops of the shoulders, tops of the breasts, the extended leg, etc. Likewise it will cast shadows on the underside of the breasts, ‘bottom’ of the arms, beneath the head (where the head casts a shadow on the neck), etc.
Anatomy: The shoulders were too broad and too square. Always use references when drawing people. You’ll notice the neck slopes down into the trapezius muscles, which then slopes down into the deltoids (shoulders), rather than forming a box with sharp points. As I said before, she’s way too thin. She doesn’t look like she’s starving, she looks like she’s lacking proper bone structures. So I beefed up the ribcage and pelvis. For the face: chin is too pointy, eyes are too high. You’ve also reduced the face to a collection of symbols planted on a general head-shape. Like everything else in the piece, there are volumes to the face. She has cheekbones, eye sockets, a protruding nose, etc.