I want to create a front view [x -y plain view] of a book for library software.
Here is an example of what I am trying to design (front view of this book cover).
I tried it myself and this is the result:
But I was not able to achieve the same look for the down curve effect (The Spine & Hindge, see red marking on the yellow book mockup). My attempt doesn't look that great. My question is how can I create that kind of down curve using Photoshop?
Here is a current screenshot of the book mockup in use.