Suggestions for images
Good suggestion about the wiki commons -- (you could perhaps add that if an open image is sourced elsewhere to consider uploading it on the Commons before embedding in WE as a way "to give back" to the free culture ;-)
Definitely a two-way street. I added a further bit. (In addition to the broader audience, I particularly like encouraging use of WC because of their strict enforcement of documentation/licensing.)
Yep - -if it were up to me, I would prefer restricting WE image uploads to the Wikimedia commons for the same reason. It would reduce our workloads in auditing the licenses of all images in OERu courses.
Video presents other challenges and we'll need to work through acceptable solutions for embedding video with our partners.