flying microscope machines

The idea was to create a robot whose job was to observe things on a microscopic level. That's what explains what the robots on the sides whose heads look like a microscope. A lot of functional things could be added, but I didn't want to over think about the design, and kill the spontaneous feeling.
once again, I started out with about 12 silhouettes, rendered six of with basic value, then further added color and more detail to these three. I'm later gonna chose one and get it to full completion.