Utilization of free textures to earn money

There are many web sites where artists can download textures for free. These textures as a rule can be utilized in free and commercial works. So how can an artist earn money with such textures? As easy as with any other business activities, it can be done by adding value. How does an artist add value to a free texture that is readily available to anyone? A lot of internet sites permit using these free textures to texture 3d models that are for sale with the condition that you will modify the texture to suit the 3d objects. It is not told exactly how much everyone must change the texture, so I think modifying the size and adding some small details should be adequate. For example a simple 3d model like a bookcase that can be modeled in 15 minutes will look more expensive with a photographic texture on it. The same is viable with any other 3d object.

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