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Those works of art in the Museum of Orsay were completed from 1848 to 1914. These include amazing collections of impressionist and post-impressionist art arranged chronologically. masterpieces by artists like Monet, Renoir and Van Gogh hang in all their brilliance just waiting to be viewed.

Hi,

How should I understand "hang in all their brilliance" in the above? Thanks.
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The paintings by these artists are notable for their use of colour, often brilliant in tone. They are also metaphorically brilliant in terms of artistic originality and execution.
So the brilliant paintings are hanging on the wall, waiting to be looked at.
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"hang in all their brilliance" : "hang showing all their brilliance", "hang surrounded by all their (aura of) brilliance"