Since I made a single mesh from the mirror modifier, I move the arms/hands so they give the movement sensation.
Here is the current render (with some light sources added):
Here's a breakdown for the video:
- The exhausting pipe is moved to the back part of the arm.
- The modifiers are applied from bottom to top (last modifier on the list, goes first)
- The arms are moved separately to make look a moving robot.
- Cylinders are added to simulate the joints between arms and hands and chest to arms.
Here is the video:
And if you want to download the .blend file, you can download it from the following link:
Hope it helps you out!