I have the same problem, even when I have enough water in the tub

I try and try and try, but still cannot take pics like the pro's here on this forum. Same as you I cannot get my koi still somtimes and have to wait on them to calm down and then they still move. I want the koi in the perfect position to take a pic and I just cant get it. Angle of the picture that you take has a lot to do with how well the pic turns out. I still cant get that angle. Pic's I take of my koi look nothing like they do in the pond. They always look skinny. But if you see my large koi in person they are thick bodied and look good. Im begining to wonder if my koi just dont take good pics

No not really it just me I cant take good pics and I still have to learn what angle to snap the shots.
Judy