A question about Prussia

[stratergy-love.livejournal.com]

Sorry, another question, I wanted to draw a picture of Hungary, Austria, and Prussia (fully inked and colored), but what colors are Prussia's eyes? I've seen in many pictures that his eyes are red but in other pictures his eyes are blue. More recently I've found pictures where his eyes are a combination of both.

So what are the color of his eyes exactly?

(If I'm doing anything wrong please tell me, I'm new at this kind of thing.) ^^