look-n; 3 Senses

Sense Number 1: facial expression

Commentary: the expression on a person's face

A sad expression...
A look of triumph passed over John's face as he finished the last piece of cake before Mary came home.
She shot her competition a nasty look before the event began.

WordNet 2.0 Sense Numbers: 1

Sense Number 2: act of looking

Commentary: LOOK[+event] look, looking, looking at - the act of directing the eyes toward something and perceiving it visually.

He went out to have a look around.
His look was fixed on her eyes.
He gave it a good look.

WordNet 2.0 Sense Numbers: 2

Sense Number 3: perceived appearance or feel

Commentary: spirit tone, feel, feeling, flavor, flavour, smell - physical appearance; can also be used metaphorically to mean the general atmosphere of a place or situation

I don't like the looks of this place.
The look of the city excited him.
A clergyman improved the look of the meeting.
It had the look of treason.

WordNet 2.0 Sense Numbers: 3 4