Mayor Boris Johnson will tell the Home Affairs Select Committee later how public confidence in policing can be restored.
It comes after revelations that undercover police officers sought to smear the family of Stephen Lawrence.
Met Police Commissioner Sir Bernard Hogan-Howe will also be appearing.
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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".