Yeah... I think we're gonna try to see if we can get way with adding little animations and bounces and emote symbols to give them more depth before committing to sinking a bunch more asset money into a thousand mouth and eyebrow variants.
A very far strech goal could also be injury/sweating for when the mech is starting to take Structure/Stress damage, akin to how old school DOOM did it. Or even when certain modules are activated, like a mad grin/terrified panic when SEKHMET is active