Thanks for the comment! I realise this is rather niche, so I don't expect too many comments, but I thought I should put stuff out there anyway.
The reason for mentioning the IAPL is just to give a little background as to where the different regions come from, so I've added a link to the world map which might shed a little more light on it. The regions with question marks on them have very speculative names, and a lot of the regions never got further than being drawn on that map, so there's scope to change the boundaries for a lot of them.
As for comments/critique, "they look interesting" is fine by me!! I'm trying to make the flags look realistic enough that you could imagine them being flown, so if they succeed there, I'm very happy. If they look too busy, have too many colours or something like that, then do point that out, as they're meant to be relatively simple in construction, like real flags.
I'm also interested in hearing suggestions for changes to the ones I've already done, either to include motifs from countries or areas that have been left out or alterations of colours or whatever, and suggestions of flags to use to make new ones for regions that I haven't got to yet.
Anywho, thanks again! I've added a few more to the first post, and I'm working on others in between revision, so I should hopefully be adding one or two a day for a while. :D