Personally I think they edges are too sharp.
IIRC, flags are resized when added to the game. So it probably screwed up the resolution.Using the new design!
Much easier to appreciate in the larger size. Is that a resolution issue? When it's small, like when viewing the nation page, the details bleed together, especially the edges, which are otherwise exceptional!
It appears the image uploaded was 150x80 and automatically rescaled to 169x90.
Thus, I have rescaled that flag to exactly 169x90:
^That should look much better when upload. (I hope).
Well I did the best I could. Still looks better than the pixilated look it has in game ATM.