The photos don't do the metallic paint job justice, it looks a lot like a glass xmas ornament.
I made the arm pieces from polymer clay to make him look more like his movie counterpart.
I removed his hands and made custom hands out of polymer clay with wire and plastic fingers (similar to my Arcee custom).
A cannon can also be attach to the end of his arm and I made a glow-in-the-dark sword for him too.
Added black pin stripes, detailed the rear lights, reflectors, wheels and side scoops of the car.
I painted the robot-mode parts in a dirty, worn and scraped metal motif so when he is a robot he looks used like in the movie and when he is a car he look new.
I mixed a metallic blue for all the parts that needed it and added lots of detail like the stripes on his shoulder guards.