What happened to all the Greek statues?
Not very much Greek sculpture has survived for us to see. You might think stone statues made of limestone and marble would last well, but both limestone and marble can be burned and turned into lime, which is one of the ingredients of cement.
In the Middle Ages, both Christians and Muslims hated Greek statues, which they associated with Greek gods. So medieval masons burned Greek statues in lime kilns to make cement. Practically all big Greek archaeological sites have medieval lime kilns in the middle of them.
What about Roman copies?
Roman copies of some Greek statues have survived (though many Roman copies of Greek statues were also burnt in medieval lime kilns).
Art historians divide Greek sculpture into seven main periods, though we are not always sure which period a statue belongs in.
Stone Age sculpture
Living in Europe, but near West Asia and Egypt, Greek sculptors learned from all their neighbors. The earliest Greek sculpture comes from the Stone Age, about 6000 BC. It’s mostly clay and stone figurines of men and women, like figurines made by other European people.
Bronze Age sculpture
Archaic Greek sculpture
Starting in the Archaic period, about 700 BC, Greek sculptors learned from Egyptian artists how to carve stone statues that would stand on their own, and they began to use the lost-wax method to cast hollow bronze statues. In Italy, the Etruscans made very similar statues.
Severe and Classical sculpture
But by the Severe and Classical periods, about 500 BC, Greek artists were influencing their neighbors as they worked to master realistic representations of muscles and bones, and varied poses – running, bending over, twisting around.
Finally in the Hellenistic, about 400 BC, Greek artists began to work with marginalized and mythical characters; they carved children, old people, poor people, foreigners, centaurs and satyrs. Also, they began to carve some women without their clothes. These statues influenced artists even very far away, in East Africa, India, and China.
Learn by doing: pick a Greek statue you like and try to copy it in clay
More about Classical Greek Sculpture
Ancient Greek Art, by Susie Hodge (1998)- easy reading.
Greek Art and Archaeology (3rd Edition), by John G. Pedley (2002) A lot of good information and is pretty readable. Plus, the author is really an expert in this field.
The Archaeology of Greece: An Introduction, by William R. Biers (revised edition 1996) Biers writes very clearly and has a lot of good pictures.