What is an example of imagery in the novel, The Witch's Heart?

Imagery:

“Angrboda was more tired than she remembered ever being, but still she did not sleep. Every time she began to doze, she was kept awake either by her heart fluttering madly in her chest or by Loki’s lips somewhere on her body. By the time dawn came he was sprawled half on top of her, snoring into her hair” (48-49).