Which words in this excerpt from Edgar Allan Poe's “The Raven” give the raven a dignified and elegant appearance?

Open here I flung the shutter, when, with many a flirt and flutter,

In there stepped a stately raven of the saintly days of yore.

Not the least obeisance made he; not a minute stopped or stayed he,

But, with mien of lord or lady, perched above my chamber door—

Perched upon a bust of Pallas just above my chamber door—

Perched, and sat, and nothing more.