Isabelle Levent

If it was possible to deduce how much of an influence each individual image has on the final outcome (and the owner of each image was known and labelled, which I currently doubt happens), would it be simple to compensate people then?

Strict synonymy, or even a drop-in replacement word, is not essential for most writers, who instead may use a thesaurus to expand an idea or discover a new one. 

Because creativity  by definition  involves not only novelty but value, and because values are highly variable, it follows that many arguments about creativity are rooted in disagreements about value.