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?
In: 980
There are a lot of reasons, difussion of light across a surface (how certain materials look when light hits and/or penetrates them makes you infer what the object is made out of at a glance), lack of scale detail—especially around the edges of an object where plastic and casts are less sharp and defined, reflections and shadow casting (both directional and ambient need to be complex and convincing), depth of field of the camera, and realistic and logical surrounding elements. All of these add up to making a believable object in a photo or drawing.
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