This is a fun way to add 'depicts' statements to Commons files: https://hay.toolforge.org/depictor/

Today I made my ten-thousandth edit on Wikimedia Commons, with this photo: https://commons.wikimedia.org/wiki/File:Empty_dining_marquee_at_Wikimania_2016.jpg (I've been going through some old photos and uploading anything that's useful for Commons; a couple of Italian railway stations didn't have any photos yet!)