Just take a look at [this picture](https://www.looksmartmodels.com/wp-content/uploads/2018/11/lamborghini-huracan-performante-spyder_03.jpg), you can tell immediately that its a model car even though there is nothing in the picture to compare its size to. My guess is that the paint isn’t authentic to our eyes, but are there other reasons as well?
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Everyone saying depth of field is correct, but the f stop and sensor size are also crucial factors here, imagine scaling a motor car object down to the size of a domino and not the camera, you would definitely be inclined to think the object is small, because you would have a greater depth of field, however if you also scale the camera down with it, you would have no visual cues to determine this smaller scale. So essentially the reason we are able to tell the scale of an object is because of the proportions of the camera and the object in relation to one another.
You could make an entire city look like a miniature set if you just scale the camera up to an enormous size so that the proportions fit those of a standard camera and a small city model, however we can’t realistically make a camera the size of a small moon, so we use substitutes like tilt shift lenses which can simulate the same effects.
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