For one of my final concept piece's I have decided to with the scene in The Pit and Pendulum were he finally wakes up in his prison and what he imagines the prison to look like as it is darkness at that moment. So here is the development from my original thumbnail. The first couple of images are experiment with the perspective till I found one that suits the description. Now I am adding the things that are in the text such as the door that quickly opens, the stone walls etc.
@Phil : I have been looking back through the the brief to check that I am on the right track and I saw that it ask for 5 preparatory studies for each painting. I was wondering what exactly is the brief asking me to do because I am starting to worry that I haven't done this stage.