Answer:
Artists added shading to figure figures a sense of form
Step-by-step explanation:
The Pax Romana (meaning Roman peace in Latin) is a period in Roman history that started with the rule of Caesar Augustus (27 BC) and ended with the death of Marcus Aurelius (180 AD). This period was characterized by the state of peace, stability and minimal military expansion, and as it started with the accession of Caesar Augustus, it is also known as the Pax Augusta.
The majority of surviving paintings from this era are wall paintings from Rome, Pompeii, and Herculaneum. The technique artists used in order to give the figures they depicted a sense of form was shading. Below you can see an example of such painting - The Punishment of Ixion in the House of the Vettii in Pompeii.