Are the colors based purely on their assumptions/imagination, or do the greyscale images retain some sort of data that tells what color on what part?
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It is based on assumption. The grayscale image only contain the brightness of an object but not its hue or saturation. The artist will therefore have to make up these by themselves. Often you can research a bit about the objects to find their hue. For example peolpe have the same hue skin color, militaries have the same hue uniforms, etc. The saturation on the other hand is more or less guesswork. And I have seen restaured photos with the completely wrong hue for objects.
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