How is Dicken's language almost poetic in Great Expectations. Support your answer with examples.

Certainly, the opening scene of Chapter I of
Great Expectations is one of the best in all of literature as there
is metaphor and much imagery arranged with parallelism in the
paragraphs :

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Ours was the marsh country, down by the river,
within twenty miles of the sea.  My first vivid impression of things seems to me to have
gained on a memorable raw afternoon toward evening....I knew that the dark flat
wilderness beyond was the marshes; and that the low leaden line beyond was the river;
and that the distant savage lair from which the wind was rushing was the sea; and the
small bundle of shivers growing afraid of it all and beginning to cry was
Pip.

Similarly, the
description of the first convict is replete with imagery and
parallelism:

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 A fearful man, all in coarse gray, with a great
iron on his leg.  A man with no hat, and with broken shoes, and with an old rag tied
around his head.  A man who had been soaked in water, and smothered in mud, and lamed by
stones, and cut by flints, and stung by nettles, and torn by briars; who limped and
shivered, and glared and growled [alliteration]; and who teeth
chattered in his head as he seized me by the
chin.

In the description of
Uncle Pumblechook, Dicken employs figurative language, using
simile:

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...Uncle Pumblechook--a large, hard -breathing
middle-aged, slow man, with a mouth like a fish, dull
staring eyes, and sandy hair standing upright on his head, so that he looked
as if he had just been all but choked, and had that moment
come--...

Another passage
of figurative language is in Chapter XXII in a passage in which Pip reflects that it has
been some time since he has seen Joe and Biddy:

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That I could have been at our old church in my
old church-going clothes [alliteration], on the very last Sunday
that ever was, seemed a combination of impossibilities, geographical and social, solar
and lunar.  Yet in the London streets, so crowded with people and so brillantly lighted
in the dusk of evening, there were depressing hints of reproaches for that I had put the
poor old kitchen at home so far away; and in the dead of night, the footsteps of some
incapable imposter of a porter [metaphor] mooning about Barnard's
Inn, under pretence of watching it, fell hollow on my heart
[metaphor]

 in
Chapters XXII and XXIII, with the description of the ridiculous Mrs. Pocket and her
frustrated husband, Dickens's language is playful, sentimental, cynical, imaginative,
and comically ironic:

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...I saw that Mr. and Mrs Pocket's children were
not growing up or being brought up, but were tumbling up..... that there were no fewer
than six little Pockets present, in various stages of tumbling up.  I had scarcely
arrived at the total of six when a seventh was heard, as in a region of air, wailing
dolefully.

...Miller, who was the other nurse, retired into
the house, and by degrees the child's wailing was hushed and stopped, as if it were a
young ventriloquist [simile] with something in its
mouth. 

Then in Chapter XXIII
the reader is introduced to Mr. Pocket:

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He was a very young looking man, in spite of his
perplexities, and his very gray hair, and his manner seemd quite natural.  I use the
word natural in the sense of being unaffected; there was something comic in his
distraught way as though it would have been downright ludicrous but for his own percept
that it was very near being
so.

Indeed, the prose of
Charles Dickens contains a poetic beauty and color throughout.