Gold-ify objects

The first thing I usually do when creating an effect, is to look for images of the real thing, so I know what I am trying to simulate.  You can use this to sample colours, and compare contrast and the way highlights work, and even the texture.

Adobe Fuse is still a Beta so free to install at this stage, and you can chose a head and rotate it to the angle you require.  I'm guessing that you have a particular head in mind though.

Because the head already has good strong colours, we can use Hue/Saturation and click on the little hand icon and then on the image, and we can adjust the Hue slider to affect only that colour range. Note we can adjust this by dragging the sliders in the colour bars at the bottom of the Properties panel

Next you need to boost the contrast with a Curves layer.  This is all non destructive and can be adjusted as often as you like

And finally, we need those strong highlights which we can create using the dodge tool directly to the head layer.

This is quick and dirty by way of demonstrating.  Note this is _not_ non destructive, so best to use a copy of the head layer.