Modelling The Protagonists

I have begun modelling the robotic protagonists of my film. So far, I have completed the basic body shape, the back fan (which was not shown in my concept sketches but helps to add to the character as the back looks less plain) and the eye, with eyelids and ball joint. So far it looks very basic, but detail will be added as the modelling process goes on and when texturing begins. The joint for the wheels has been completed, but as it will not be seen for the large amount of shots not much detail is required for it.