Why are shadows and ligh so important in creating realistic images?

Shadows and light are crucial in creating realistic images because they define form, depth, and texture, helping to convey three-dimensionality on a two-dimensional surface. Light creates highlights that accentuate features, while shadows provide contrast that enhances visual interest and realism. Together, they guide the viewer's eye and establish a mood, making the scene more engaging and lifelike. Proper manipulation of light and shadow can evoke emotions and set the overall tone of the image.