Printmaking is the activity or occupation of making pictures or designs by printing them from specially prepared plates or blocks.
The four main types of printmaking are Lithography and Intaglio
Lithography is printing from a stone or a metal plate with a smooth surface it can be used to print text or artwork onto paper or other surface material.
Intaglio is the family of printing and printmaking techniques in which the image is incised into a surface and the incised line or sunken area holds the ink it is the direct opposite of a relief print.
Relief printing is printing from raised images as in letterpress and flexography.
Screen printing is where you face ink or metal onto (a surface) through a prepared screen of fine material so as to create a picture or pattern.
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The sculptor was following a Roman tradition at the time to portray emperors as other-worldly, almost godlike beings. He makes his eyes very large and his face stoic to convey that he his someone not quite human like the rest of us, and perhaps he is above the fleeting emotions that govern the rest of mankind.
A staff symbolizes leadership in Roman culture. A staff is a long pole like object that men and women would have in Ancient Rome.