How does David Foster Wallace use imagery in The Pale King?

Imagery:

"Past the flannel plains and blacktop graphs and skylines of canted rust, and past the tobacco-brown river overhung with weeping trees and coins of sunlight through them on the water downriver, to the place beyond the windbreak, where untilled fields simmer shrilly in the A.M. heat: shattercane, lamb's-quarter, cutgrass, sawbrier, nut-grass, jimsonweed, wild mint, dandelion, foxtail, muscadine, spine-cabbage, goldenrod, creeping Charlie, butter-print, nightshade, ragweed, wild oat, vetch, butcher grass, invaginate volunteer beans, all heads gently nodding in a morning breeze like a mother's soft hand on your cheek."

"A moment later Toni was out around the side of the store, sheltered from the lot's view by the Kluckman Ice dispenser, with the plastic bag's top whipping and popping between her shoes as she removed a traveler's Kleenex from her handbag, tore it in two and again, and wrapped a quarter of the tissue around her little finger, whose nail was perfect and almond-shaped and done in arterial red."