Some of these were very hard to find so I apologize for any low quality images
Despite a very exhaustive search I could not find Kristrún Frostadóttir's signature as it appears almost exclusively digital signatures are used in Iceland. The same goes for Luís Montenegro of Portugal.
Despite an extremely exhaustive search I could not find Alexandru Munteanu of Moldova.
If they have multiple signatures for different scripts/languages their native language/language native to their country's signature will be used (Japan and India)
For one country with co-presidents both signatures are in one image and either name is accepted, same goes for a few with multiple governments or disputed leaders