How does Michael Connelly use imagery in The Black Ice?

Examples of Imagery:

"Bosch drove down out of the hills into Hollywood, traveling mostly on deserted streets until he reached the Boulevard. On the sidewalks there were the usually groupings of runaways and transients. There were strolling prostitutes—he saw one with a red Santa hat on. Business is business, even on Christmas night." Chapter 2, pg. 8

"There was a random feel to the dark, the quirkiness of chance played out in the blue neon night. So many ways to live. And to die. You could be riding in the back of a studio's black limo, or just as easily the back of the coroner's blue van. The sound of applause was the same as the buzz of a bullet spinning past your ear in the dark. That randomness. That was L.A."
Chapter 11, pg. 97