Dick, I always like young Shusui when the blue is bright, but as they age it always seems to turn gray. Then I get fixated on the dorsal scales. If any are out of straight, or size proportion, it drives me nuts. I dislike lateral line scalation, so those get knocked off the list (not to mention the ones with stray scales someplace!) Then, I do not like the red covering the blue ... if it is bad on Asagi, it should be bad on Shusui. ......So, I really like the ones that have none of these failings!
P.S., just to show how perverse I can be, once I saw a leather-style doitsu from a Shusui hatch that was entirely persimmon, except the head was gray and there was a narrow strip of gray along the dorsal. It was a very gracefully shaped male. I thought it was fantastic ....and absolutely awful as a Shusui! I've got no taste.