The answer is parallelism.
The subject of the sentence is her sketches. Also at the beginning of the list it says their unusual perspective so you have to continue using plural pronouns.
The sentence should read: Her sketches are unusual because of their unusual perspective, radical use of color, and their unexpected subjects.
I would visit the 1950s because there is so much history and a lot happened back then and I would be there and be a reporter to learn everything and to know more
