Testing techniques

Before I start taking the photographs I need for this assignment, I thought I'd have a trial run at creating a double exposure. By knowing the process that I need to go through, I will be able to look out for the right type of images that I'll need. The image above is of a brick wall within a tree. I wanted to try a monochrome effect so that the colour didn't distract from the final result. However I feel as though this image isn't quite what I was intending. Colour would have made the brick wall obvious. I also think that the shape of the tree isn't clear. I might need to change my approach...and change the tree.