A koi judge told me my Tancho spots were too small and not round. They were round, on the texture. The texture wraps a head that's narrow and long, so on the fish they came out as little ovals. Now the spot is measured on the fish itself,

A koi judge on r/Koi said all my fish had skinny tail roots, the bit just before the tail. On a real koi it stays thick, because that's the muscle that swims.