Johan......I reckon your eye for koi is very decent!
I like to think I have a moderately decent eye and these all appeal to me except for the 3rd on, if the 3rd one's face just had a break of white on it then that would have been super....I'm just not a fan of menkaburi (full red face).......the front is just a little too heavy for me....sorry.
The same for the 2nd, altho the pattern is much better with the red nose, here a break on the shoulder would have been nice, also just a little front heavy but still a very nice sanke.
The first one I really hope the hi holds on this one, the sashi worries me a bit on that 2nd step, just hope that is not a sign that the hi is going........if it does and you get sumi on the back and in between the hi patterns on shiro then can be a very nice looking fish.
Last is my favourite....really a nice pattern, well balance hi pattern, and the sumi looking good in the right places, mouth looks nice and big.....hope everything holds and more on this one.
Furthermore I think they are very decent additionals to any pond, well done!