He will glance back and forth at the scene to see what's happening.

They look at each other with admiration.

I would glance back and forth at the watch to make sure I'm not late.

The onlookers admire the work of art with fascination.

She is a passionate regardeuse of French films.

The female spectators are attentively watching the performance.

The beholder carefully observes the painting.

They love to look at each other for hours.

They have been glaring at each other since they had an argument.

You have to think twice before making an important decision.