maybe I can see what your saying they both seem to sport the bucket head look and have similar design language. But I made this guy with a more grunt role in mind so I tone down any grandeur that I could see but for a guy like megatron I'd actively add more
Well from the looks of it the way you designed him makes it seem as though he was built for a job that needed more endurance and strength rather than speed or maneuverability.
Great pic, awesome job.