How does Charlotte Bronte use imagery in Villette?

Imagery:

"This had, this Reason, would not let me look up, or smile, or hope: she could not rest unless I were altogether crushed, cowed, broken-in, and broken down. According to her, I was born only to work for a piece of bread, to await the pains of death, and steadily through all life to despond. Reason might be right; yet no wonder we are glad at times to defy her, to rush from under her rod and give a truant hour to Imagination - her soft, bright foe, our sweet Help, our divine Hope."

"Once - unknown and unloved, I held him harsh and strange; the low stature, the wiry make, the angles, the darkness, the manner, displeased me. Now, penetrated with his influence, and living by his affection, having his worth by intellect and his goodness by heart - I preferred him before all humanity."