Describe how your impression of the raven changes as the poem progresses?

Initially, the raven appears as a mere bird perched upon a bust, seemingly harmless. As the poem progresses, its mysterious presence and eerie repetition of "Nevermore" create a sense of foreboding and unease, transforming the raven into a symbol of sorrow and despair. By the end of the poem, the raven's unchanging response to the narrator's questions leaves a haunting impression of finality and loss.