He is a beautiful roo but something tells me there is another breed in that line. Or a "project Golden Duckwing Welsummer".
His beak should be either yellow or horn in color.
His legs should be yellow.
Eyes should be red, not yellow.
His chest feathers should not have any gold leaking, should be at least black with silver mottling.
Here is the UK standard: (I do not have the USA standard here yet) for the Silver Duckwing....replace Silver with Gold words.
PLUMAGE COLOUR
SILVER DUCKWING: MALE
Head, neck and hackles white. Breast, black with white mottling. Back, shoulder coverts and wing bow white. Wing primaries, flight feathers (out of sight as wings closed), inner web black, outer web white; secondaries, outer web white, inner web black, with white peppering, coverts black with green sheen forming a broad bar across primaries. Main black with beetle green sheen; coverts, upper black, lower black, edged with white. Abdominal and thigh fluff, black with white mottling.
I've seen Gold Duckwings, and the gold color on his back is normal, smutty kind but the UK breeders are working on enriching that color.
If you don't mind, I've been up most of the morning and need a break....I have the Welsummer's book that I will have look up more on.