The word "Epstein" refers to a proper noun, specifically the last name of a notable British sculptor named Sir Jacob Epstein. He was born in the United States and is well-known for his sculptures, including busts (which are sculptures of people's heads and necks) and larger, sometimes controversial works. He lived from 1880 to 1959.
In art history discussions, you might refer to his influence on modern sculpture or critique specific works he created.