Please make sure to use images of the below sizes while using Book Landing Page WordPress theme.

Book landing page single post/page with sidebar: 770 X 520 px

Book landing page single post/page  without sidebar: 1200 X 520 px

Book landing page featured post: 310 X 207 px

Book landing page banner image: 650 X 510 px

Book landing page blog home: 435 X 332 px

Book landing page about block: 585 X 712 px

Book landing page review block: 630 X 366 px

Book landing page homepage blog: 370 X 247 px

Book landing page books thumb: 270 X 345 px