Note: You do not have to take anything of what I say seriously if you don't want to..
Model issues(in my opinion):
The straps are too skinny, make them thicker.
Perhaps add a variety of colors to the model..
ex:make the straps darker and add a transparent pupil in the center of the module.
Tip: Don't use Ambient Occlusion when rendering your models, try using a hemi lamp with no specular.