drawing
i guess ears don't really have a sizing guide. they have a real fucky shape 
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drawing
Yes, ears are kind of weird, and toes too, I think. Especially the pinky.
drawing
It's worse than that...
Old people's ears just keep growing so they don't even have any consistent proportion through a lifetime. Plus some of them have the earlobes attached and some don't.
drawing
the ear doesn't have a real easy way to be like "this area is 1/3rd of that"