Commons and Wikidata provide images that can be used in *all* wikis. https://commons.wikimedia.org/wiki/Commons:Project_scope
https://lists.wikimedia.org/pipermail/wikitech-l/2015-April/081465.html :
>> I wonder if this can somehow be connected to Wikidata's image attribute
>> (https://www.wikidata.org/wiki/Property:P18).
>
> This is a very good idea, because it circumvents the problem of autodetection that PageImages has for instance and that takes away the ability of editors to ‘author’ the result.
The steps are:
# fetch and use P18 (preferred rank if multiple P18 are set) where there is no image suggestion at all from PageImages;
# use P18 when PageImages is not so sure of its pick (e.g. small images which might be icons?);
# always prefer Wikidata P18 where available and not deprecated.
Step 1 would already be useful, step 2 could solve multiple weaknesses, step 3 would help resolve most bugs in PageImages.
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**See also**: {T91683} (which can potentially be implemented separately)