Six tents that were put up outside the London Stock Exchange earlier have been removed by Police.
Officers told demonstrators from Occupy London that they had thirty minutes to leave the area in Paternoster Square.
Dozens of people gathered there after a day of May Day protests in the capital.
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The painting, entitled 'Beautiful Beautiful George Michael Love Painting', was auctioned to help raise funds for HIV and Aids prevention.
The 38-year-old victim was standing on a busy Victoria Line train when another passenger approached him.
The boy, called Roman, told police call handler his mum "is dead" and "she's closing her eyes and not breathing".