Hi. You really have nice studies here. I especially like your studies on women. Say, did you use references for that? Either way it's a nice exercise to familiarize yourself with anatomy. It shows how much effort you're willing to exert to better your skills. Although I can't shake off that feeling I get that your art appears like incomplete sketches. Your drawings basically lack proper tonal rendering to make it look complete so to speak.
Also, when you sketch poses, they look really nice. Although the problems start appearing when you actually put in the details. I don't know if you want to go into realism and whatnot, but there are slight anatomical distortions. I'm talking mostly about how huge your hands are, and also how distorted your heads are at some areas. When I say "distorted" I'm talking about your heads not having proper joints that connect it to the neck. It looks unnatural to say the least. Especially this drawing.
Other than that I think you'll turn great if you keep up with your current attitude.