The image in works so well because it compares two forms of light. The design principles used here is that of contrast.
What is contrast in painting?
It's a word commonly heard in creative and artistic circles. When it comes to art, contrast is accomplished by arranging contradictory components together.
Although these aspects are diametrically opposed, their combination can be alluring. In fact, contrast in painting may be called the golden law of art.
Contrast in art is the method of juxtaposing dissimilar visual components to convey meaning and emphasize the work's features. Artists use a variety of tools to create contrast, including shadows, light, color, scale, and arrangement.