I thought it would be  fair to publicly thank Fred and his team at Ranchcomputing on this forum.

Thanks to them, I could have this image published in 3D World magazine (#92 july)
http://www.renderosity.com/mod/gallery/index.php?image_id=1407097

Without  their precious help I would not have been able to render the image before the tight deadline in the resolution and quality required for printing purposes.
Subsurface scattering combined with displacement mapping on some objects
litterally freezed my machine !!!
The expected render time was of several dozens hours on it, the Ranch rendered it in barely ONE hour !!

many thanks to you guys !!!  :-)

Paul