Drawing pictures by Boris Grigoriev, "Portrait of a Girl." Examination of authenticity.

[nasekomof]

Welcome colleagues. The other day in the community of Facebook , I asked for help in determining the authenticity of the picture Grigorieva. Administrator rehash my post to the forum. I am grateful to all who responded.
  Finally, I took photos of the drawing. True poor quality. Due podstekolya of intense reflection .
 The picture belongs to a respectable lady, who are confident in its authenticity. Let me remind you , the picture belonged to her late husband and the ladies in the house about the seventies . To reproduce a copy not like. As for the fake ( up) then in those days Grigoriev has not been as a commercial artist , and no point in copying was not. The more difficult to copy the image . And why?
  However, the Russian Museum "Girl " set (such as) in 2011. So where's the same script?
  I would be grateful to all those who respond.