You won't really be needing any templates for this.
Steps:
1) import your cover into PicsArt.
2) click on the brushes option.3) choose the type of brush you want. you can also zoom in your picture for a better drawing.
4) after you are done, click on the tick mark at the right and then click on the arrow mark on the right and save your image to the gallery. you are done!
example of a cover I did:
YOU ARE READING
Book Cover Tips
RandomIn which I teach you how to design a professional yet simple to do cover for your book and other cool Manips and Edits. Highest Rank in #bookcovertips➡1 Highest Rank in Non-Fiction➡16 I also accept cover requests in this book! [Cover requests...