Are Guardian's eyes yellow or white?

[Tawmis]

I'm working on an art project and I got to looking at reference art and Guardian's eyes are inconsistantly colored. (Inconsistancy? In comic books?)

I found this community in the same searches and I figured if anyone knew this level of detail it would be the folks hanging out here. Any help you can provide is greatly appreciated.

Excelsior!

I think - I'd need to check - when he's using any powers - it's yellow.
When he's just standing there, talking, they're white.