In an attempt to undercomplicate things...

You can upload your photos somewhere and hit either this list, design-team@lists.fedoraproject.org, or the talk page [1] with your link. Photos we're interested in using will then be uploaded to http://fedorapeople.org/groups/designteam/Projects/Picture%20Book/Photos/.

More information is available at https://fedoraproject.org/wiki/Submitting_images_for_the_picture_book

[1]: https://fedoraproject.org/wiki/Talk:Submitting_images_for_the_picture_book