As far as the v1 paint and sculpt, I really think it's because they were going off the promo shots which were innaccurrate to the final film, and knowing how WB can be about images and stuff, I can imagine before the film's release they were a bit tight with what images they let out.
However, the costume's issues aren't tied to that. The reference materials we know Harue worked off of were right for the film, and even Harue's original prototype costume was much more accurrate than the official prototype and final figure, so who knows why that turned out as it did, but it wasn't for lack of source images.
However, the costume's issues aren't tied to that. The reference materials we know Harue worked off of were right for the film, and even Harue's original prototype costume was much more accurrate than the official prototype and final figure, so who knows why that turned out as it did, but it wasn't for lack of source images.