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Here's the deal. The most impressive sculptural artwork will always be the Egyptians. These giant heads look to be made of limestone/travertine. Soft AF to work with and not very brittle. Marble is made of the same stuff (mostly) as limestone, but much much denser. It is still soft, but slightly more brittle and impurities in the marble could lead to some challenges. Good marble is extremely consistent in grain, allowing for the uber detail in the renaissance sculptures. They are beautiful, but as a stone guy, they don't make me scratch my head with regards to technique.
PIC rel - NOW THAT is fucking hard to do - It's basically made of brittle, dense granite, orders of magnitude harder than marble or limestone. How the Egyptians pulled it off is beyond me, there are many such examples and some are hollow on the inside with very tiny openings, literally make no sense.