Hi Rodrigo, I don't know for sure what colour this green was intended to be originally but in reproduction pieces it can look darker and more blue or lighter and more green, I think depending on the lighting. So you could probably paint it any one of a number of different shades and get away with it, although I believe there would be an expectation of it being a fairly dark colour.
Judging from the photos
here Phthalo Green Blue Shade might actually be a good starting point for mixing the darker, bluer version if you wanted to start with a green paint. But a mixture of a dark blue (such as ultramarine) with your Naples Yellow or Gold Ochre might get you to the right sort of colour a little faster, and help with achieving a matt finish.
Adding just black to the main mixture might work fine for the shadows (since it's already quite a dark colour) and for the highlights I'd try mixing it with just a little white by itself, only enough to create a noticeably lighter colour. If you would prefer the highlights a little greener, I'd suggest adding in a little Cadmium Yellow or Gold Ochre, if you want them a little more subdued (duller) add in a touch of Cadmium Red or a red earth, or alternatively mix them from the base colour + some light grey.
Einion