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Well, in this case, it's a picture of a presumably old, broken headlight (it's perfectly round and the body of the vehicle is very rusted, making it appear fairly old). The subject matter might or might not interest you. If you were into old vehicles, you might wonder what the year, make, model, or even what kind of vehicle this is. Perhaps you'd ask yourself where such a vehicle was found; on the street, in a junk yard, or wherever? Curiosity about the subject is an important component of an image. If it doesn't generate curiosity in anyone, then it has failed at a fundamental level. Another way to look at this image is as a semi-abstract. Sure, it's of a real object, but it is largely about shapes, tones, and lines. That it happens to be a headlight is, to a large degree, irrelevant to the image.