Mapillary or Kartaview are the typical choices here to add free street-level imagery which can then be used for OSM purposes as well.
What also works is Wikimedia Commons. There's a good mobile app. You can take pictures of a POI, upload them and later associate them with that object in OSM (or via Wikidata).
What also works is Wikimedia Commons. There's a good mobile app. You can take pictures of a POI, upload them and later associate them with that object in OSM (or via Wikidata).