"There's nothing new under the sun." -John Lennon
Every narrative, every composition has existed in one form or another for as long as people have been able to create. The tools and mediums for these have continued to evolve over time but the inherent core of these compositions have remained the same.
In any creative effort, while it's clear that it's not the first incarnation of a composition, it's the artist, their perspective that creates something unique.
Every artist regardless of medium has a unique approach and an entirely unique perspective to breathe life into their compositions. The combination of elements; tone, saturation, angle, lighting, settings and even characters are utilized in a distinct manner that only the artist envisions.
While there is nothing new under the sun, every composition is an assemblage of elements and while those elements may have been used before by another artist, the variations of each element assure that each composition is wholly unique. Every individual has their own perspective and this means that a person can observe the same composition but see different features of that composition.
So long as there are artists, there will always be unique compositions regardless of medium.