Detailed instructions on how to make a novel cover.

This mainly depends on what kind of products you design.

My view on the writing of design instructions is to describe your design works in the shortest way.

Description includes: creative source, product characteristics, processing technology, etc.

If you have worked as an intern in a professional design company, you should have some experience. Their design specification was written by a special person. Of course, designers are the people who know the products best, so I suggest you look at the design descriptions of some award-winning works at home and abroad to improve your response to product design!