Watch how you're drawing clothes. They look pasted on. Fabric is thin but it still has some thickness. The outline of clothing, hair, etc, etc, should always be set a little thicker than the doll. Another part of it is because you're following the base shading and when you're dolling something that's not following the base exactly, you just seem lost. Look at some references if you need help, is all I can suggest for fixing this. Folds are folds, no matter if it's in a photograph or on a doll. Also, try to incorporate some details... and I'm not saying to draw on a million accessories but just little things like adding seams--something that doesn't compromise your vision of the doll but still adds interest.
Another suggestion: when you're dolling, try to think about how what you're drawing would work in real life so you can avoid visual contradictions. For clothes, ask yourself things like "How does the body affect the folds? How do props affect it? How does gravity affect it?" For example, on your first doll, the skirt looks very 2D because there's no back to it. It's just there, like she's not really wearing something that's wrapped around her. Along with that, even though the base arguably suggests that Lilith is sitting on the couch, the skirt doesn't seem to be affected--it's floating.