Dp2M
XE1 50 1.5 Sonnar
XE1 35 1.4
There's more than one way to understand and practice chiaroscuro (lots of roads lead to Rome, i.e.), but my preference is to start with darkness/shadows, and wring the most light from the least possible illumination to highlight the subject. With people, I want to show how the person is like a flickering candle, a personal flashlght in the impersonal darkness.
In Caravaggio and those he influenced, the illumination may come from a candle, a torch, a a high window (The Calling of Saint Matthew), or door flung open from a bright outdoors into a dim interior. Substitute a smartphone screen or overhead light in an Airbus overnight flight, you still have manifold possibilities for dramatizing the intersections of light and darkness in a person, a family, an intimate or ceremonial space.
GRD3 (evening light coming in from glass doors facing a river)