How does Charlotte Bronte use imagery in Jane Eyre?

Imagery:

"Such is the imperfect nature of man! Such spots are there on the disc of the clearest planet; and eyes like Miss Scatcherd's can only see those minute defects, and are blind to the full brightness of the orb...."

"And was Mr. Rochester now ugly in my eyes? No, reader: gratitude, and many associations, all pleasurable and genial, made his face the object I best liked to see; his presence in a room was more cheering than the brightest fire...."