Describe the characteristics of the Source material in this artwork's Subject matter.
The painting depicts, as the title states, an archery contest with the goddess Diana and the nymphs that were her followers.  As discussed in many classical sources such as Virgil's Aeneid, Hesiod's Theogony as well as Homer's epic poem The Iliad, this scene is depicting the goddess and the others after a hunt. Diana was often depicted in texts and works as a child, rather than a grown woman. Similarly, her nymphs were often portrayed in the same way as the goddess's blessing kept them from aging.