I always had curiosity on Gosho's unique drawing style for the eyes. For instance, characters from Japan would have that unique eye/iris drawing style whereas foreigners and Black Organization members have a simpler style for their irises(Except for Mizunashi Rena and Rei Furuya when they're not posing as Black Org.). Japanese characters, when surprised or scared, have their iris style changed into the more simpler style. Also, some characters have smaller irises than others, usually female characters have big ones while male characters tend to have smaller ones, for the exception of a few. Is there any particular reason for this?
Examples:
Conan, who is Japanese.
When surprised.
Jodie, who is from the USA.
Chianti, who is Black Org.
Rei Furuya, who is Japanese.
Rei posing as Bourbon/Black Org.