Nicolas
Thank you for posting, since I have been a bit absent, I was beginning to think that people where moving to the other sidewalk : )
You are correct with the painting, It has been sitting for a long time on my desktop and I studied the way he composed the seemingly informal composition. If you see, I used his choice of angle, and the way he placed dark grapes and white ones. In the painting, look at the way he has a fig and a pear in a sort of a "tango" dance. (I did't do that exactly, but used figs for whatever sexual connotation.
The lighting and clarobscurity of the painting and my image is a very good question. I didn't spend a lot of time lighting it, just used one Elinchrome head with a small diffuser (about 40cm square) on one side. If you see the highlight in the painting you notice the light is specular.
My image looks a lot flatter on line after the conversion in PS, but it has some deep shadows.
I want to do another interpretation (copy) of Caravaggio where you can see a person holding a basket of fruits ...
But, as you said, it is difficult, but since long ago I have been wanting to work on natures mortes (and love the name too in French and Spanish)