BC eyes on a normally sized human face are supposed to be one eye lenght apart. It's just the rest of the body. Her spine is... let's just say that a realistic human being wouldn't be able to live with a spine like that (same applies to most other characters). The "realistic" face measures and fiction anatomy makes it look a bit bizarre.
people keep posting the second image as the "old" miyabi but I'm quite sure that's just an edited image of her to exaggerate how spaced apart her eyes were. not saying they weren't space far apart but it really wasn't as bad as some make it to be. the first image should be the actual old version of her
She looked fine back then honestly, I prefered her sharper Gainax like eyes. And If you pay close attention to every other character, their eye gap is just as far as OG Miyabi's...
