I would advise you to make the color of the edging of the helmet gold like on the shield, and the helmet itself is metallic gray like on the shield. And the shoulder pads have a edging in metallic gray like on a shield, as well as its spikes in gold like gold on a shield.

This would be the right combination I think.

Or at least if the pauldrons should remain unchanged - then at least make his spikes metallic gray, and change the red color of the surface of the pauldrons to metallic gray too, and then the edging can be left gold