How does Christopher Moore use imagery in Bloodsucking Fiends?

Imagery:

"She started to run her fingers through her hair to facilitate the preliminary untangle, fighting the tension in her arms that seemed to be increasing every second. A large moth buzzed into the bathroom and went for the light above the mirror. Before she knew what had happened, she snatched it out of the air and ate it." —Chapter 14, pages 92-93

"When they finished she held his face against her breast and listened to his breathing becoming slow as he fell asleep. Tears crept from the corners of her eyes as dawn broke, releasing her from the night's last thought: I'm loved at last, and I have to give it up." —Chapter 31, page 246