How does Mary Shelley use imagery in Frankenstein?

Shelley uses imagery to mark the passage of time.

"Six years had elapsed, passed as a dream but for one indelible trace, and I stood in the same place where I had last embraced my father before my departure for Ingolstadt. Beloved and venerable parent! He still remained to me. I gazed on the picture of my mother, which stood over the mantel-piece. It was an historical subject, painted at my father's desire, and represented Caroline Beaufort in an agony of despair, kneeling by the coffin of her dead father. Her garb was rustic, and her cheek pale; but there was an air of dignity and beauty, that hardly permitted the sentiment of pity"

She also uses imagery to illustrate Victor's emotional state.

"Morning, dismal and wet, at length dawned, and discovered to my sleepless and aching eyes the church of Ingolstadt, its white steeple and clock, which indicated the sixth hour. The porter opened the gates of the court, which had that night been my asylum, and I issued into the streets, pacing them with quick steps, as if I sought to avoid the wretch whom I feared every turning of the street would present to my view. I did not dare return to the apartment which I inhabited, but felt impelled to hurry on, although drenched by the rain which poured from a black and comfortless sky"

Imagery is also used to describe physical reactions to devastation..... inner turmoil.

"The blood flowed freely in my veins, but a weight of despair and remorse pressed on my heart, which nothing could remove. Sleep fled from my eyes; I wandered like an evil spirit, for I had committed deeds of mischief beyond description horrible, and more, much more (I persuaded myself), was yet behind"