There is an acting exercise where you put a bandanna over your face, and you practice sending all of the emotions using only your eyes, and it is supposed to make you great like Clint Eastwood. Clint does a lot with his eyes.
In the store I watch people's eyes, and you can see happy eyes, and angry eyes, and tired eyes.
I try to send people smiling eyes. I try to send a smile with my eyes.
Salute,
Tony V.