Focus on this artwork and analyze the Subject matter.
As the title states, the subject matter is that of a mythological scene depicting Diana, the goddess of the hunt, the moon, virginity, and wild animals This painting shows Domenichino's capability with landscape painting as well as his knowledge and familiarity with antiquity art styles. The men within the painting serve as allegories, representing all manner of things; namely, spying, lust, risk, and ultimately, the danger that they are putting themselves in due to their own actions.
Regarding the nymphs, there is one in the water that is looking directly at the viewer. This is Domenichino's way of bringing the audience into the painting, breaking down the barrier of viewer and subject. The nymph is smiling, as if she has caught the viewer in the bushes, watching this scene play out, therefore likening the viewer to the men in the painting.Diana is most easily identifiable in this painting due to the upside-down crescent moon tiara on her head.  Normally, she can also be identified by her bow and quiver of arrows.
Domenichino