I think my favorite combo for Gold NMM is to match it up with purple robes. Since purple can be made cooler, almost towards blue (I did this in the shadow areas of the folds). This lined up well with the coolest color in the golds, which was green.
Reflecting the warmer purples into the metal surfaces means that I can get some variety in those metal colors, and then have the cooler blues turn the metal a greenish tone. That provides some saturation contrast, making my highlight areas seem even brighter by comparison!
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