I have darkened the dark areas so as to enhance the images of Jesus, but that also makes the text a little harder to read. I don't think that this will be a problem after it's printed.
The images of the people will not be clearer, but the text will be. After clicking the image (above) you will see a 150DPI image (click it again to enlarge it). It's quite sharp but the actual timeline for printing will be 400DPI.