The eyes are the window of the soul.
They can tell an awful lot about a person.
I'd keep away from the purely subjective, Remember what George W. Bush said about Putin's eyes?
"I looked the man in the eye. I found him to be very straight forward and trustworthy and we had a very good dialogue, Bush said according a BBC account. I was able to get a sense of his soul. Hes a man deeply committed to his country and the best interests of his country and I appreciate very much the frank dialogue and thats the beginning of a very constructive relationship."