How does Jane Austen use imagery in Mansfield Park?

Imagery:

"It often grieved her to the heart—to think of the contrast between them—to think that where nature had made so little difference, circumstances should have made so much, and that her mother, as handsome as Lady Bertram, and some years her junior, should have an appearance so much more worn and faded, so comfortless, so slatternly, so shabby."