Koi fish

An artwork I did for a client.
When I'm beginning to sketch this piece, I study about Koi fish and realize that there are so many kinds of them with many diffirent names. So I just search some images of the names on google and do some research.
Like you see the first one was the white fish with orange and black color area, it's nearby the pink lotus. This Koi fish was the worst fish in the picture, because I didn't study, just paint radomly  colors that I like. Well, the aftermath is the fish bit of wrong of anatomy, and color. I don't know what kind of Koi is that, (no offence, the first guy ^~~^ I really don't want my fish read this)  after that I paint the other fish better a little. My favorite one is the goldden boy. it's an Yamabuki Ogon.
You can find out more kinds of Koi fish on google. It's a whole lotta stuff to learn about them.
Have fun!