This one is a fine example of me outsmarting myself. On the original
cover, there was a slightly ugly text box in the bottom right corner. It was in an area too complex to airbrush (for me anyway), so I decided to cover it with a modern-looking price/copyright/date box, which stupidly I didn't keep on a separate layer. In the end I decided it didn't really look right, and would rather have had the title box. The moral of this story is: Think twice before merging changes onto the background layer.