Draw a rectangle for the front cover
Add a second slightly offset rectangle for the back cover
Connect the corners with short diagonal lines to show the book’s thickness
Sketch the spine along one side
Add a curved line on the front cover if the book is open slightly
Draw page edges with a stack of short parallel lines
Add a few horizontal or vertical lines for page texture
Include a slight perspective if the book is viewed at an angle
Refine the cover shape and straighten the edges
Erase extra guide lines
Darken the final outline
Add simple details like title lines or a bookmark if desired