How does Charles Dickens use imagery in The Posthumous Papers of the Pickwick Club?

Imagery:

"Waiter! raw beef-steak for the gentleman's eye,—nothing like raw beef-steak for a bruise, sir; cold lamp-post very good, but lamp-post inconvenient—damned odd standing in the open street half-an-hour, with your eye against a lamp -post—eh,—very good—ha! ha!"

"I don't remember forms or faces now, but I know the girl was beautiful. I know she was; for in the bright moonlight nights, when I start from my sleep, and all is quiet about me, I see, standing still and motionless in one corner of this cell, a slight and wasted figure with long black hair, which streaming down her back, stirs with no earthly wind, and eyes that fix their gaze on me, and never wink or close. Hush! the blood chills at my heart as I write it down—that form is HERS; the face is very pale, and the eyes are glassy bright; but I know them well. That figure never moves; it never frowns and mouths as others do, that fill this place sometimes; but it is much more dreadful to me, even than the spirits that tempted me many years ago—it comes fresh from the grave; and is so very death-like."