whether this is indeed an authentic,lost work by Caravaggio, as Mina Gregori, or one of the world's main authorities on the painter,is claiming, then we need to revise what we know approximately the artist and lower our standards accordingly. And that is unthinkable.
Look at the badly drawn left forearm, and the clumsy fingers,the uncertain physiognomy. It's a ham-fisted composition that Caravaggio would have been incapable of painting.
Documents connecting the work to Cardinal Scipione Borghese, which are being taken in support of the attribution, or ought not to be allowed to persuade us otherwise.
[br]The family who own the painting have expressed no desire to sell it. Even were they to change their minds there would need to be a near consensus among Caravaggio scholars for the work to realise what an autograph work by the artist would command. Such a consensus seems highly unlikely.
Source: blogspot.com