Emoji concern

It's a standard theme. All companies that make emoji characters put their own spin on the design for each character. For the ghost emoji, most of them have one larger or winking eye. You can compare them here: https://emojipedia.org/ghost/

Another 74,239 characters to go.

Neither Apple nor any of us would know - emojis are created here:

https://unicode.org/emoji/proposals.html

Design choice.

https://emojigraph.org/ghost/