How does controlled use of value improve depth and readability in black-and-white illustrations?

Example Concept: Value refers to the lightness or darkness of a color, and in black-and-white illustrations, it is crucial for establishing contrast and depth. By varying the value, artists can create a sense of three-dimensionality, highlight important elements, and ensure that the composition is easily readable. Effective use of value can lead to a more dynamic and engaging illustration, as it helps to separate foreground from background and define the form and texture of objects.