I know you can't see it on black/white pictures. I've actually done a search for his eye colour and I think this is the opinion of historians / people who have met him. The reason for that he was painted with blue eyes could be his own propaganda: a perfect German should have blonde hair and blue eyes, you know. So, how would this look like if the one send by the destiny, the "biggest German", (that's not my opinion, but it is the picture he paint of his own) wouldn't fit that ideal in no ways? Well, it's your LH, but I would give him brown eyes.