are you drawing for fun, an art career or to get into entertainment media?if your drawing for fun Id say just keep doing what your doing and dont really think about it to much. draw what you like and you will improve naturally as you go.if your drawing for a career in fine arts, where is your passion? is drawing a napkin or a floating eye the thing that makes you most exited? I think what Im trying to say is you should push yourself more, what about a landscape, or a whole scene? a single object floating in space is not really that interesting to look at.if you want to get into the entertainment industry, you need to think more about design and the subject matter, just rendering something wont get you anywhere. you need to have your own ideas and designs, and preferable try to tell a story with them as well.I hope that clarifies things a little bit.