I reached a moment of confusion looking at this:
https://booru.allthefallen.moe/posts/350189
Miyuki's pupils are in the direction of her mouth instead of her eyebrows/forehead.
If she were standing I would be thinking she is looking down
But she is on her back with her pelvis raised, looking at a partner who is above her... so is that looking up?
Basically I'm wondering if we're talking about 'up' in terms of gravity (absolute up/down) or in terms of the orientation of one's head.
You can compare in "upside down" poses too...
https://booru.allthefallen.moe/posts/343644 cream's pupils are toward her nose
https://booru.allthefallen.moe/posts/323976 edward's pupils are toward her brow
so is it cream=up ed=down like if they were upright, or does being upside down swap that to cream=up and ed=down?
I'm thinking perhaps no swap because in some cases we might lack a frame of reference for absolute up/down (like a loli floating in space) in which case the only consistent frame of reference is the face itself?