The phrase "huge poster" is correct and can be used in written English.
It is a noun phrase that describes a large poster. Example: The city was covered in huge posters advertising the upcoming concert.
Huge poster of a pop group from England with Three Stooges haircuts.
"In my bedroom, I had a huge poster of the skyline of New York".
Caught amid throngs of helmeted police, some pointed gloomily up at a huge poster recently hung across from the square.
ISTANBUL — There is a huge poster near the town hall of the Istanbul borough where I live.
Where a huge poster of the deposed president Hosni Mubarak once stood, a new one declares: "The Army.
A huge poster commemorating the happy event is the first thing new arrivals see at Paro airport.
In Alexandria, a huge poster of Vladimir Putin was unveiled along with the words "Bye bye America!".
Only one checkpoint had a full complement of uniformed soldiers, near a huge poster of the president.
Rebel fighters are firing both in the air in celebration and at a huge poster of Colonel Qaddafi.
A huge poster on the side of the Bernabéu used to show the galácticos in various action poses.
