This website has got reference-pics for pretty much all Kaiba-characters! I’m saving the link here so that it’s easily accessible for me and others. It’s super useful if you wanna draw fanart. It’s in japanese, but it’s easy to navigate through the six galleries in the small orange menu! Even if you don’t wanna draw fanart, I’m sure you’ll appreciate the art if you’re a Masaaki Yuasa-fan, or just into animation in general.