The 3D mockup in Blender is ready to be painted over for the next artwork.
Here you can see a small part of the render, a few books I've created for the scene.
This is a great small exercise, and you can find public domain covers and wonderful tutorials online :). The books can be bent with proportional editing for a more old and used look.
They are not perfect, which is fine because only a rough reference is needed.
Have a great weekend <3!