How does Dean Koontz use imagery in Odd Thomas?

Imagery:

"My uncertain declaration of love inspired her to turn the gun upon herself. She pressed the muzzle against her throat, angling it slightly toward her chin, the better to blow out her brains."

"I wanted to please her. Pleasing her pleases me, and then the birds sing sweeter than usual and the bees make better honey and the world is a place of rejoicing—or so it seems from my perspective."