The "Center of Interest" in a piece of art or photography refers to the main subject that draws the viewer's attention. This could be a person, an object, or a specific area within the composition. For example, in a portrait of a person, the face is often the center of interest, as it conveys emotions and tells a story. Creating a strong center of interest helps to guide the viewer's eye and enhances the overall impact of the artwork. Techniques like contrast, color, and placement can emphasize this focal point. In a landscape featuring a tree against a sunset, the tree might serve as the center of interest, making the scene more engaging.