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When the first movie came out, I read an interview where someone said that the Autobot faces are modeled after the Autobot insignia and the Decepticon faces are based on the Decepticon symbol.
Amazingly, if we go by that theory, Lockdown's face is modeled after the Quintesson insignia:
The original plan may have been to have Quintessons as The Creators but the Writers' Room changed it to a single Quintessa