Nasa Book Front Cover Development

I want to be overly simple in the layout of my work, and I think the image of the moon half-toned really communicates the feel I want with my book, it can also look really interesting when experimenting with overlaid areas of tone. As one of the criteria I have set for the brief I want to produce the entire book in one colour to reduce the cost of a large print run. I feel like doing the job on a budget will create the vintage feel I want to create.