The colors, fonts, images, and cover designs you choose are critical to the success of your book, so you should opt for a mockup that can help you to make your book cover design as well as your inner book design. Here are two fantastic book mockups provided which can take advantage of for designing different parts of your book at the same time. By the way, these scenes feature thick paperback books from different perspectives and angles.
In particular, there are two closed books placed on each other in the first scene and there is one opened book from the perspective angle. You can easily apply your own artworks of the cover design through the front and the spines of the books in the first scene as well as the inner design through the second scene using smart objects.