Hey Julius, Nice attempt of a pretty ambitious image. When composing a picture, the first thing you have to do is decide what your main focal point is going to be, Then you compose your elements to support that. Then decide on the secondary focus, and tertiary focus. Once you have done that, if you want depth in your image, have foreground, middle ground and background elements. Then pick a light source, that will help keep all your elements lit the same. All of these things can be worked out a head of time in thumbnail sketches, something I highly recommend if you want to do these kinds of images. I hope this helps, keep drawing :)