You can use these Flickr features as Feeds content sources:
Username: Give us the username of a Flickr user, derived from their URL, to pull in all the photos posted by that user.
Album: If you'd like to display the photos from a single Flickr album, enter the album_id from the album's URL, with an asterisk preceding it. For example: the album id of this album: https://www.flickr.com/photos/vetbonkie/albums/72157653439738204
72157653439738204 . Entering it into Feeds would appear as:
The album must not have privacy settings enabled for it to appear within Feeds.