How large of a thumbnail should the thumb_url property point to by default? Or should we provide a set with a variety of sizes, as is done in mobile-sections-lead for the page image thumbnail?
Topic on User talk:MHolloway (WMF)/Drafts/Compilation endoint schema
We should probably mimic the summary end point. One thumb and one full.
Cool. 320px seems to be the convention for the thumbnail image size; continue that here, then?