Hey, that's a really good start. I especially like the figure studies and the handstudies. Keep it up!
Just one quick tip: Try to use less lines in your sketches, or only one clear line for contours. It makes the sketches a lot more readable and makes you really look at the form and curve of the subject's "outline", so you can reproduce it with only one line.
A good way of forcing yourself to use less lines is to scribble with ink for a while, before going back to pencils. It helped me a lot.