Less than 11 hours left - a little clue to help you going:
@james-show pointed out correctly that the H on the picture is obvious. This letter is extremely important and other writings on the wall don't matter.
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Second clue:
The position of the letter H in the picture is very important.
Third clue:
See this article for inspiration. The basic idea here is quite similar. The answer has 10 letters (sometimes written as one word and sometimes as two) and begins with H.