The picture Vier Friedenssteine (Kösen).jpg is not accessible for me from Singapore. I can access it if I use VPN with a different country setting but not without. So it might be a problem only with the server responsible for Singapore.
The error message I get is (trying to load https://upload.wikimedia.org/wikipedia/commons/8/8c/Vier_Friedenssteine_%28K%C3%B6sen%29.jpg ):
File not found: /v1/AUTH_mw/wikipedia-commons-local-public.8c/8/8c/Vier_Friedenssteine_%28K%C3%B6sen%29.jpg
I think I recently had another picture with the same problem, so it might not be a unique problem, but could not find another example right now.
Topic was discussed in German at https://de.wikipedia.org/wiki/Wikipedia:Administratoren/Anfragen#Hauptseite but will soon be archived. Nobody else had a problem, but to my knowledge also nobody tried a VPN via Singapore.