How does Mildred Taylor use imagery in The Road to Memphis?

Imagery:

"I rose from the bed. Opening the door, I went onto the wet porch and just stood there in my long cotton nightgown, staring across the blackened lawn. The music played on. Then as suddenly as it had awakened me from my sleep, the music stopped, and soon Stacey came walking from the forest and across the road and up the damp grass, a box in his hand."