Anything is permitted on your sketchbook, as it's yours. But remember that this community in general (conceptart.org) has a particular way of viewing things. As in "abstract art sucks". Your stuff seems pretty abstract, and varied which is a good thing. But try to focus more on the things that you like and try to learn to become better. How? By reading and practice! By investigation! Try to do things that the other people here in CA.org would do, like post more and more anatomical studies, and stuff like that. Please the crowds. That way you'll get more replies and comments. I want to question, how old are you and what are you studying?