Answer:
1.Using fossils as a base
2.Creation of the tissues and muscles out of clay.
Explanation:
The fossils available are used as a base for the reconstruction of the face. Without the well preserved and near complete skull there is no possibility. There must be a good level of preservation of fossils in order to reconstruct the fossils.
The sticks are first placed to approximate the depth of tissues over the bone. The tissues and muscles are molded out of the clay.
Finally the detailed painting creates the skin color, texture and expressions of the facial reconstruction.