His keen eyes soon found what he was looking for.

I know only too well the keen eyes of the French police.

They were keen eyes that could see far and well.

You always had a keen eye for the main chance.

She looked up into her husband's keen blue eyes and said, "I thought we would talk right here."

But he has a keen eye on the open sea.

He kept a keen eye on the player for several months.

His keen eyes took in the details of the situation.

His keen eyes were on the faces of the living, not the dead.

Yet his keen eyes seemed to sense what had occurred.