I just wanted to chime in on the color discussion and give a couple of pointers based upon my experience as a professional photographer for over 15 years. First of all white or a variation of white is one of the hardest colors for a camera to get right. All cameras have built in white balance and it will interpret what it deems as white in the specific light conditions. Film was easy, because it was always set up for natural light or white light. Depending on the lights used to illuminate the model, each give off a different color temperature which casts a different hue when photographed. Better cameras will give you the ability to adjust the white balance for your lighting conditions based upon using a neutral grey card.
This is why when looking at different reference photos of the same white or off white model it looks different all the time. A flash is designated to emit white light, but the problem there is it usually blows out whites completely. So unless you have seen it in person and compared color swatches to the model (which I know some have done), photographed it in white light, or know the exact base color the ILM guys used, it's impossible to say. Here is an example:
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As you can see two totally different colors. The only difference from what I can tell is the second photo added a flash from the camera. The second would be a more accurate representation of the actual color because it used a flash adjusted for day light, however still not totally accurate because the secondary flood light casts a different hue to it. And to make matters even more confusing, we all know that after adding washes, weathering, airbrushing, etc... you will end up with a color different than the base color you started with also. Anyway, hope this helps.