What I really think you need to do is do some life studies - focus on what the body looks like underneath clothing. It's very hard to read any of your bodies and positions because the clothing is also visually incredibly hard to read. I think it would be helpful to post some naked anatomy sketches and works so that you can refine your construction of the body. Once you have constructed the body better, then you can progress to working on the costumes above and on the skin.

No matter what style you study, any dedicated artist probably has a shelf of photo books with poses, close-ups, and body shots. A lot of artists move on to be able to pose the body in their mind but it's only after they develop an intimate understanding of how the body itself moves and works. If possible I'd suggest you find a local community college that does real life drawing sessions and chip in a few bucks to sit in and work with a live model. If you can't do that, find some nude stock artists and use their work to study the human body - and I'd love to see the results of those studies. By doing those you can start to learn how the body is constructed.

As I've mentioned before, it is very hard to 'read' your clothing designs. I can't tell what is a ruffle, what is a crease - the lines you use are the same for each and every one of those items. I can't tell if the fabric of her costume is sewn in very thin columns and the dress is pieced together like that or if the dress is made of a light material that fluffs. I would also suggest that, as you do anatomy studies, you also do cloth studies so you can learn how to vary the weight of your lines to imply different clothing styles and different fabric. Look at how a t-shirt lays on a body versus a pair of jeans - see the differences those have in how they cover and show the body? Look at silks, vinyls, and knits and see they way those different fabrics affect the look of a costume. Study how fabric drapes so that when you draw you can convey the construction of the clothing and also accurately depict how it falls and forms in relation to the body that is wearing it.