Perhaps something like this?
Not my work, but this was the painter's directions:
"The gold armor is done using a
GW Tin Bitz base (airbrushed). Then I airbrushed on P3 Solid Gold for the midtones and Vallejo Airbrush Colours Gold for highlights. The Vallejo gold is almost a silver colour so it worked well for highlighting. Finally, I airbrushed Daler Rowney sephia ink to give it a more "brown" tone. The sephia ink was also applied with a paint brush in all the recesses too.
The wings I spray primed black, then spray primed white at an angle to get some shading. Then I airbrushed enchanted blue between the larger feathers before painting the end tips white by hand. Then I airbrushed white to smooth out the blends."