If I understand correctly, this is requesting a single additional column in https://commons.wikimedia.org/wiki/Special:ListFiles that lists the number of pages/wikis each image is used at.

E.g. https://commons.wikimedia.org/wiki/File:Monks_in_Wat_Phra_Singh_-_Chiang_Mai.jpg
as seen in https://commons.wikimedia.org/w/index.php?title=Special:ListFiles&offset=20130512111402&limit=20&user=JJ+Harrison&ilshowall=1
would have an extra column titled "Usage (pages / wikis)", and the row for that image would say "11 / 9" (it's currently used in 11 pages across 9 wikis).

As noted in the discussion, there is already a way to get this via tool labs, using the Glamorous tool,
e.g. http://tools.wmflabs.org/glamtools/glamorous.php?doit=1&username=JJ+Harrison&use_globalusage=1&ns0=1&show_details=1&projects[wikipedia]=1&projects[wikimedia]=1&projects[wikisource]=1&projects[wikibooks]=1&projects[wikiquote]=1&projects[wiktionary]=1&projects[wikinews]=1&projects[wikivoyage]=1&projects[wikispecies]=1&projects[mediawiki]=1&projects[wikidata]=1&projects[wikiversity]=1
but that is a complete list of usages, and takes a long time to generate/load.

I think there are 2 potential goals here:

1. Do the task as suggested, and add a simple numerical count to the Special:ListFiles page, in core.
2. Make Glamorous faster to load, which will encourage everyone to use it more. - Possibly just reducing the number of results (default is currently 1,000) would help a lot? I've asked at https://bitbucket.org/magnusmanske/glamtools/issues/46/increase-speed-or-reduce-freeze-of --- Once Glamorous is faster, Add a link to Glamorous, within https://commons.wikimedia.org/wiki/MediaWiki:Listfiles-summary (the description line at the top of the special page). If possible it should automatically use the name of the user, if a specific user's uploads are being looked at.

Doing #1 would help all 3rd party mediawiki users, as well as all Wikimedia users who just want a simple results count. Hopefully, it is relatively easy to pull the globalusage figures for each file, and add them to a new column?
Doing #2 would help the power-users.

Does this look like a good Outreachy project, scope wise?
From above, 1) looks easy, not sure about 2)

Scope wise, and Outreachy internship project should ideally take 2-3 weeks for an experienced developer .

No, this is not a good outreachy/GSoC project.

Removing the Possible-Tech-Projects tag as we are planning to kill it soon! This project does not seem to fit in the Outreach-Programs-Projects category in its current state, so I am not adding that tag right now!