Sky Atlantic has posted this art in their Game of Thrones season two picture gallery, alongside some of the publicity stills and the “fan poster” that posted yesterday.
Source: Winteriscoming
Also this art use as a cover for HBO tie-in edition 'A Clash of King' so we think it might be the official poster (The AGOT tie-in cover was the official S1 poster):
Source: Phoenix Florid
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