The lesson
Make the cover an example of the work, so the buyer judges your taste before reading a word of your argument.
A dark grey booklet photographed on a white surface carries the four letters N, E, X, T in white, each rotated and scattered across the cover instead of set in a line. There is no subtitle, date or sender on the front.
Don't copy the scattered lettering, which belongs to NeXT's name. Keep the discipline of a front cover carrying only the buyer's name, treated as the first piece of the work.