I'm pretty sure that type of artwork is made to represent her visual design in the game itself. Her official design has always had blonde hair (outside of a piece from Final Fantasy VI Advance where you can see her with brown hair).
It must be the similar case of why Link's hair is pink in A Link to the Past for Terra/Tina's hair to be green in Final Fantasy VI.
I mainly pointed out because with him saying the "JP version" that made it sound as if he thought it was a change in localization when it clearly wasn't, and if anything you'd have characters being changed from exotic colors (or all black) to BLONDE as Raw Danger readily showed.
Even with the excuse of being "JP version" in that it's the game's artwork, well, a lot of that actually WAS shown here, printed in Nintendo Power, printed in the strategy guide... knowing the Terra was blonde in the artwork absolutely some weird thing only the Japanese saw, but anyone that followed Nintendo or wanted the strategy guide. I do think that they may have corrected the colors on Locke's clothes though as I swear that matched with his in-game stuff in NP/the strategy guide, but I may be misremembering.
Yeah but then you get the rest of his catalogue... I like Nomura's early stuff a lot, and I think he started off as a great artist for the company. I also think the guy is kind of out of practice these days since he's focusing on other parts of the company (the way he draws muscles is particularly funny/weird
...and fucking hell, why is his Dissidia version of Terra starving to death? You can't be hot unless your ribs are protruding out of your chest?
Obviously starving both of them to get them in a suitably bad, sour mood for the game. Cloud was far more legitimately emo in Dissidia than he was in most of FFVII, and he just had a full on breakdown when there was cause for it, and I recall Terra being pretty meek throughout and I don't recall her being that bad in VI (though that was always a much longer time ago, and not played when I'd be attentive to that like replaying FFVII after seemingly the whole internet pegged him as an emo.)