I spent a bit of time analysing what could work best for Hemmy's expressions when it comes to facial rigging. For this I drew a few extreme expressions using squash and stretch. It turned out that the best feature for his expression will most likely be his big eyebrows and his ears. It's best to keep his snout/beak more solid with a possible slight, tilt in case his face deforms completely and turns into a completely different character.
I looked into facial muscles around the eye and forehead: the obicularis oculi (muscle around the eye), the corrugator (eyebrow muscle), the frontalis (the forehead muscle) and the procerus (muscle inbetween the eyes, just above the nose). Each of the muscles will most likely have separate controls or blendshapes.
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