
I guess I wasn't "as good" as I thought!
After everything said here, I decided to lighten up and make life easier on myself by using some CA BY SA images, since they are far easier to find than CC0 for many things I need.
So mentally taking this to the next step, I imagined a reference page for the images... now the question is, should each pic have an internal link to its CC attribution on this separate page? If so, I will have to create dozens of backlinks so the reader can return to where they were reading when they clicked on the picture. (This is a 73k-word book!) Or can I count on e-readers to have a back button and use it? That doesn't seem wise or user-friendly.
OTOH if the page is unlinked and more like an acknowledgements page, then I guess the attribution page will list the name I give each picture as the way to show its attrib info... author,
author's given title, and CC BY SA hyperlinked to the license.
Which way were those of you who suggested this thinking to do it?