Soelistyo: We need Dick to give you his views. He very much enjoys Shusui. On the other hand, I believe Shusui is one of the most difficult breeds of all. They suffer all the potential problems of Asagi, and then their Doitsu character adds more opportunities to fail. Finding one without a distracting weakness is very unusual. Even among the prize winners I see in pics from Japanese shows, there is seldom one that does not have some fault that just glares at me. And, of all the faults, one that is common is for the dorsal scales to be of uneven size, or to have vacant spaces along the back, or in the area near the head; or to have multiple scales converging at a spot, instead of a single perfect row from back of the head to dorsal fin, with evenly matched scales marching in line along each side of the dorsal until rejoining as a single file procession from the rear of the dorsal to the caudal fin. And, so often the scales will vary in color so that they appear uneven when they are actually fairly similar in size and orderly in arrangement along the back. I become quite fixated on the scales along the back.

....Which brings me to point out that there is a nice even quality about the scales along the back of your Shusui, although I see spots where the scales seem to be doubling up, etc., in the main it looks fairly decent. It is hard for me to say for sure from the photo. Still, it did not make me grimace! (And, that's a compliment.) ...Kept my interest enough so I wanted to look at the blue. The shadows on the head will clear, the fish is very young still. We need DickB to comment on the yellow. ... But, the speckles of Hi are a detraction. Altogether, not a bad example of a Shusui, but suffering from many shortcomings as all Shusui seem to do.
DickB has commented how is looking for the right Shusui to add to his "blue koi" collection. Happily, he is a very patient person.