That is gonna be sweet when it gets finished.I know that this isnt the "norm" with Koi, but I think it would look good done in shades of black and grey with lots of white highlights and just a hint of color.Just my opinion.
I like the sun, but I think that the moon makes them look unbalanced.Maybe if the moon was the same size as the sun it would look more symetrical.Not "knocking" your ink or your chest(I like both)just saying it makes your boobs look uneven.