Hi there and welcome to the forum.
A Hi Shusui is mainly judged by the line of mirror scales. It should be in a straight line, no scales out of place, well outlined, same spaces between scales. It should have a clean head and obviously the body shape is very important.
Your Shusui is clearly a male and therefore the body shape is not very good. It has a sharp nose which is not desirable. It lacks a bit in uniformity of the mirror scales and the white between the scales puts me off. Therefore it is not a good quality shusui in my opinion. Still a nice pond fish. Enjoy!
E Mail: email@example.com ; http://www.koionline.co.za
Koi are not my whole life but make my life whole