I add thumbnail captions to the page below the organization (since thumbnail are for organizational pages): See https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Book%3A_Basic_Principles_of_Organic_Chemistry_(Roberts_and_Caserio)/01%3A_Introduction%3A_What_is_Organic_Chemistry_All_about

Delmar

Using captions for attributions is fine for images embedded in page text. 

What about the thumbnail images for categories/sections/topics?  They don't have captions.  The attribution could go in the page Summary, I suppose, but that is a bit clunky.  Any other suggestion?

Thanks,
Jerry

-- 
Delmar Larsen, Ph.D.
LibreText, Found & Executive Director
https://LibreTexts.org