what kind of contrast is made between mattes presence at the door versus Zeena's

When Ethan gets home and finds the door locked, it takes a moment for Mattie to answer. The wait reminds him so much of the previous night that he half-expects to see Zeena there.

"She stood just as Zeena had stood, a lifted lamp in her hand, against the black background of the kitchen. She held the light at the same level, and it drew out with the same distinctness her slim young throat and the brown wrist no bigger than a child's. Then, striking upward, it threw a lustrous fleck on her lips, edged her eyes with velvet shade, and laid a milky whiteness above the black curve of her brows."