Why can't I work with nature?

It always seems to Die on me for some reason. Yes this is my Art home work completed for a few reasons.             1. I do not do well with adding shadows to images via my mind, so yes this is all done via ref photos or out of my head.                                                                                2. I am lazy                                                                       3. I have nothing else to add, I know floating objects bug some people at times but not really me. 

So I have just been sketching recently but last night and today I was finishing up on this. It is just a normal piece of paper size.