If I was you Id would pick something religious from the middle ages, this is the subject that defined art around this time. God was a much larger part of peoples lives. Alter boards are often great examples of this.
Ive just picked a random fresco Its The last Judgement by Pietro Cavallini but any alter work I think would suffice. http://www.lib-art.com/artgallery/8284-t… Now you have options here you can decide to go for a religious comparison or a non religious one from the Renaissance era. Of course the church was still very important during this time but It was treated very differently by the great artists of the day.
My religious option is (of course :p) the alter wall of sistine chapel The Last Judgement by Michelangelo. This is a good one to compare because although both depict the same scene the differences in technique, composition, content and (of course again) ... more.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.