Well lets take a look shall we?
Key important element to metallics always is contrast. See that there's both dark browns and whites on the gold? Now it's not entirely necessary to go that dark, the final white highlights can make or break gold.
Hmm, you got the dominant warm yellow in order. Work on the placements of lights and darks, it's not light corner/edge>dark middle piece, look at other works in nmm to look at placement (yes, even though you're using metallics, go figure, but good metallic shading is more easily found when looking for nmm...). And the undersides of the edges receive different lighting then the tops of the rims of his shoulderpads, so they should be shaded seperately.
Look at the transfer of colour on top of the rightmost bar, third from the bottom up. You can clearly see the colours there. It goes from white->warm yellow->brownish orange and finally to dark brown. Which, if you look closely is also orange-ish in colour. Not reddish, like you're having there. Copper is slightly more reddish in tint in its shadows (only slight).
And I'd personally also get a slight bit of blue in the crevices of the white, not only to give it more depth, but that'd work as a nice complementary contrast to the gold.
On another note...thin down your paints or use less paint on your brush, the appliance looks rather thick. It almost looks like you dipped in white chocolate...hmmm chocolate.