Another update from the mighty Google!
Image search has now been updated to include more filtering options. Now you can not only filter images by whether they are news content or not, or whether they include faces but you can also now ensure you only view images which are; Clip Art images, Line Drawings or Photo Content.
Simply search for any item, then click the “Any Content” drop down menu above the search results, or you could of course use the Advanced Image Search page. Very good Google, very good.