Juxtaposition Sketch Idea

For my juxtaposition sketch I will be drawing a feather falling in front of a brick wall with a barred window. My idea for this sketch is the contrast between the organic lines of the feather and the inorganic lines of the brick wall. I also want to show a tone juxtaposition between freedom (the feather) and the brick wall (imprisonment).
https://img1.etsystatic.com/000/0/6135434/il_fullxfull.298448827.jpg