I opened a Flickr account, which was straightforward, and searched for libraries to follow. (I also folowed some travel accounts because the photos were so beautiful). I wasn't sure how to check for creative commons licence initially, but by clicking for more details the copywright was listed.
After doing Thing 19 on copyright I decided to delete the two photographs that were here as a record of my learning process! Not only were they not commons copyright, but by not referencing them fully I could not easily find them again. Another reason for full, accurate & attributable references.