Make a tutorial video/screencast for how to add cover art in MusicBrainz
Make a video targeted for uploading to the MetaBrainz YouTube channel that goes through entering cover art on MusicBrainz through Cover Art Archive and other means. Have a look over the how to for which things to cover at a minimum, but don't just read it aloud verbatim.
The video should be 10 minutes long at most (the shorter the sweeter).
The video should be made available for use by the MetaBrainz Foundation under the Creative Commons Attribution‐ShareAlike license, so make sure you're not using assets (e.g., music) that can't be published under this. If assets you're using require you to use another Creative Commons license that might also be acceptable—discuss this with the mentors.