Kujaku in Japanese means Peacock. No one has told me this, but a few years ago at a koi show I was impressed with a large Kujaku pictured below. When I enlarged the photo, each scale has a darkened outer edge that looks like the famous ABC Peacock symbol less the colors. When these fish are large, they are gorgeous.
It is also important that the white be dynamic and the pattern be uniform.
Directly below is a photo to demonstrate the Peacock like scales and below is a large Kujaku. As I recall it was about 20 inches long.