A £10,000 reward is being offered for information on an Essex house fire that killed a mother and her five children.
The blaze killed Sabah Usmani, her daughters Hira and Maheen and her sons Sohaib, Muneeb and Rayyan in Harlow last month.
Police are keen for information on a group of young men seen outside the house on the night of the fire.
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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".