This mech suit by dicken liu has a few excellent part usage of note. The head of this domed bot is from the Star Wars buildable planet Death Star, and the super laser makes a perfect eye. But that’s not the only spherical part… the Minifig-sized gyro sphere from Jurrasic World forms the outer cover for a tiny rotund pilot.
That is quite a build.
The picture itself is very effective, albeit a bit dark (some details are lost).