How does the author use imagery in the novel, They Wish They Were Us?

Examples of Imagery:

“The bell rings and I know that nowhere will be safe today. So I keep going, my head down, my skin on fire, and dash through the front door, past the senior lounge, and into AP Physics. When I get there, my usual place next to Nikki is already taken” (173).

Nikki flashes her megawatt smile then swipes a lavender-colored wrapper. “Life’s too short to have just one.”