How does Tracy Chevalier use imagery in Girl with a Pearl Earring?

Imagery:

"A painting in a church is like a candle in a dark room - we use it to see better."

"He rubbed the swollen lobe between his thumb and finger, then pulled it taut. With his other hand, he inserted the earring wire in the hole and pushed it through. A pain like fire jolted through me and brought tears to my eyes."