When describing the appearance of a black and white photograph, it's important to focus on the interplay between light and dark, as well as the texture and form of the subject. Shadows play a particularly important role in black and white photography, as they can add depth and contrast to the image. Texture can also be emphasized in black and white, especially when it creates a lot of contrast. When describing a black and white photograph, try to convey the essence of the subject through the shades of light and dark, rather than relying on color. Look for contrast, patterns, and lines that can help guide the viewer's eye through the image. With practice and experience, you can learn to see the world in black and white and create stunning, timeless images.