I am anticipating a bit... but I wanted to give a quick head-ups on the topic of image reuse.
From last WLA (2014), we can identify 5893 images uploaded. Out of 5893, distinct images reused : 411, which is 7% of total.
Main reuse are
en.wikipedia 98 en.wikibooks 97 pt.wikipedia 88 ar.wikipedia 78 fr.wikipedia 72 meta.wikipedia 67 fr.wikibooks 35 he.wikipedia 12 de.wikipedia 11 ru.wikipedia 10 outreach.wikipedia 8 pl.wiktionary 7 ja.wikipedia 7 en.wikivoyage 6
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In 2015, we have collected 5687 images With a few days left, we can say that we are... VERY STABLE :)
Current distinct images reused : 57 (=1% of all images uploaded)
I think the strategy of submitting the best images for Quality Images is excellent. It will allow to do a filter of images and will help contributors to reuse those on the wikimedia projects.
Anthere
