You said the lighting is nog the same as in the original painting. Does this
include the lack of reflections on the varnished woods? the cello and the
mirrorframe are reflective, judging from the painting, however, your
rendering doesn't show any of this. I would think that some reflection on
the varnished wooden surfaces wood enhance this image...

For the rest, all I can say is: "      " while I'm amazed...

oh, one more thing. The cloth is stitched(?), right? In any case, I guess it
is made of many small threads. Maybe you could bring some of that back with
the technique developed and showed a while ago by Kedar Patil
(http://news.povray.org/povray.binaries.images/27430/)?

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