It is unique style that we don't have on CC, simplistic and very professional exectued. Only downfalls are the colour used for Bouganville and the Southern Highlands appears the same; the fourway border, and missing bridge.
2 on the other hand is very good also, but a little overly fussy for PNG, there is one line on Karkar that doesn't meet up but should, and I'm not too sure about the artwork being in appropariate style for PNG.
But i still prefer #6
Just my two cents worth.













