One of the best ways to learn koi appreciation is to view show quality koi on a regular basis.
You can study the principles, but without practice and viewing of examples, you will not be able to choose the right koi.
Therefore I am going to post images of the show winners in South Africa on a regular basis.
Herewith the show winners at the 2008 Bloemfontein show. Look at the principles and ask yourself the question, why did these Koi win.