Using a wet mixture of Quinicridone Gold and Burnt Sienna, I have touched in some of the gold edges on the dish. Use varying mixtures of these colors. Where you see a lighter value in your photo reference, paint it lighter. Where you see a darker value in the reference, paint it darker. To make it darker in value use a slightly stronger pigment and perhaps use more Burnt Sienna than gold. It is amazing to me how different the piece begins to look with this addition of warm colors!