How does Barry Unsworth use imagery in Sacred Hunger?

Imagery:

"New shackles were being forged here, in the light-filled loft, amid smells of oiled canvas and raw hemp and tar, the creeping fringes of the sail-cloth, his feelings for Sarah Wolpert and for his father."

"'That face on the easel is the face of plunder and death, sir, it is the face of Europe in Africa."