How does Debra Dean use imagery in The Madonnas of Leningrad: A Novel?

In Part X, the climax of the narrative, Dean makes extensive use of images and narratives of hope. The green lilac seen by Marina, and the green leaf carefully observed by the elderly one, evoke the imagery of spring in the past and the imagery of dawn in the present ... the sudden appearance of the young soldiers and the gift of the old woman alongside the resurgence of Helen's interest in drawing and the elderly Marina's return - all suggest new beginnings, possibilities, and a release from suffering.