What are two quotes best embody how the imagery develops supernatural atmosphere of the raven

Then, methought, the air grew denser, perfumed from an unseen censer / Swung by Seraphim whose foot-falls tinkled on the tufted floor." (Lines 79-80)

"And the Raven, never flitting, still is sitting, still is sitting / On the pallid bust of Pallas just above my chamber door; / And his eyes have all the seeming of a demon's that is dreaming, / And the lamp-light o'er him streaming throws his shadow on the floor (Lines 103-106).