The first image is from Nostalgia Press's 1978 re-colored version.
The second image is from Fantagraphics Books' 1991 re-colored version.
The third image is from the original Syndicate proof sheets which will eventually be used in Fantagraphics' Prince Valiant Volume 6 later this year.
While I think the Danish colorists behind the 1991 version made a (heh) valiant effort at capturing the glory of Foster (the less said about the Nostalgia Press version the better), it's pretty obvious which one is the keeper here. (Also, Foster didn't make the native Americans the color of boiled lobsters.)