Copyist

Winslow Homer, Art-Students and Copyists in the Louvre Gallery, Paris, 1868 (wood engraving)

A copyist is a person who makes duplications of the same thing. The modern use of the term is mainly confined to music copyists, who are employed by the music industry to produce neat copies from a composer or arranger's manuscript. However, the term is sometimes used for artists who make copies of other artists' paintings.