Would be a whole lot better if that stupid rabbit emoji/watermark on every page weren't there for no reason.
Then you can also save each image as a proper indexed (e.g. 32 colors, or even less), instead of 32-bit RGBA (You sure as heck don't need a full 8 bits of alpha). Did a test run and cut page 12 down from 1.03MB to 244KB with hardly any noticeable visual difference. Saves bandwidth for everyone.