Writing Prompt Wednesday!!

Whelp-- as you may have noticed we weren't able to bring you a writing prompt last Wednesday. However, we hope the below one makes up for it.

He had been observing her for sometime now. She didn't get angry often and generally had a pleasant disposition. Her hand shook as she hung up the phone, her face still red from the harsh words she'd nearly shouted. She hid her face behind a the curtain of her hair and sighed. He thought that sound was the most perfect sound in the world.