I don't know "Artist" in the IPTC standard, see https://www.iptc.org/std/photometadata/specification/IPTC-PhotoMetadata . Google also uses "Creator" an/or "Copyright notice" https://developers.google.com/search/docs/appearance/structured-data/image-license-metadata .

As the WMF-Legal project tag was added to this task, some general information to avoid wrong expectations:
Please note that public tasks in Wikimedia Phabricator are in general not a place where to expect feedback from the Legal Team of the Wikimedia Foundation due to the scope of the team and/or nature of legal topics. See the project tag description.
Please see https://meta.wikimedia.org/wiki/Legal for when and how to contact the Legal Team. Thanks!