photo credits:
8 - By Llorenzi [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
9 - Genusfotografen (genusfotografen.se) & Wikimedia Sverige (wikimedia.se) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0) or CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
10/11 - Genusfotografen (genusfotografen.se) & Wikimedia Sverige (wikimedia.se) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0) or CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
12 - By Steve Evans from Citizen of the World (Brazil) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
13 - By Steve Evans from Citizen of the World (Bhutan) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
14 - Graham Crumb/Imagicity.com [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
15 - By --AliYoung.com 04:35, 25 September 2007 (UTC) (原创作品) [Public domain], via Wikimedia Commons
16/17 - By Ferdinand Reus (originally posted to Flickr as Old and wise) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons
18 - By Muaz Asim (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
19 - By Loran Davis (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons
20 - Genusfotografen (genusfotografen.se) & Wikimedia Sverige (wikimedia.se) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0) or CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
21 - By McKay Savage from London, UK (India - Faces - Rural Farmer in Tamil Nadu) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
22 - By SergeyZonder (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
23 - Graham Crumb/Imagicity.com [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
24 - Graham Crumb/Imagicity.com [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
25 - By Alex Proimos from Sydney, Australia (One Heavy Day/Night) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
26 - By Omer Mor (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
27 - Graham Crumb/Imagicity.com [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
28 - By This photo was taken by Przemysław Jahr Autorem zdjęcia jest Przemysław Jahr  Wykorzystując zdjęcie proszę podać jako autora: Przemysław Jahr / Wikimedia Commons (Own work) [Public domain], via Wikimedia Commons
30 - By U.S. Navy photo by Mass Communication Specialist Seaman Apprentice Brian Read Castillo [Public domain], via Wikimedia Commons

(portraits 1-7 and 29 use original photos/graphics)