Overhead and vertical orientations are both acceptable approaches to photographing books.
Pango seller @bethanylovesbooks' listing for this Jane Austen collection includes multiple angles and details.
@ettebooks' shop shows a great example of the power of simple photos with even lighting.
@booked.with.allie uses her shelves as a consistent backdrop.
@amy523115 shows how some small props on the edge of a shot can add character to your pics.
Noami at @3starsandup displays excellent lighting in her shop photos.
Elizabeth's shop showcases limited editions in all their splendor.