Roman art is distinct from greek art in a variety of ways, including:

Greek artists would often paint their sculptures, though the Romans preffered them plain (evidence of this can be found in tombs, though most was destroyed by time and the elements.) 
The Greeks also gathered inspiration from mythology, athletics and daily life. Romans gathered inspiration from mythology, architecture, and nature.
The greeks were best known for their distinctive vases, which were red and black in color.
The romans went more for naturalism and illusionistic. 

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