Critique the design here.

This design was originally a Shirt.Woot design I created on the 4th of July for the Energy derby. I felt then and still now that there can be a lot more done with this design to make it better.

I personally feel that there could be a lot of additional gadgets and electronic devices in the design to fill up the immense open space below the characters.

I'm not dedicated to the name or shirt color of the design in any way. ALL ideas from feedback will be considered.