How does Jodi Picoult use imagery in Second Glance: A Novel?

Imagery:

"My last cut, on the wrists, is the deepest. The pattern for this gash is already there, a blue chalked line beneath the surface."

"The warrant to exhume remains from the Pike property was burning a hole in Eli's pocket, but he kept it there like a coal close to the heart, to remind him what he was doing and why."