How does Terry Spencer Hesser use imagery in Kissing Doorknobs?

Imagery:

"Letting kindness get that near to pain is like giving fire some oxygen. Each time it happened, I cried harder and harder and harder as my eczema secretly spread to my torso and made an appearance behind my knees."

"She dismounted her victim like a warrior heroine, and bent down to look him in the face. 'If you look at my sister again, I'll get our baby sister to kill you."

"If I was a slave to my thoughts, Greta was a master of the universe. If I was a victim of my quirks, she was a victor over bullies and evils."