Nice pic of an unusual duck, well it is unusual for me anyways!
Two things I would suggest...
1. It's a shame that the duck is slightly obscured by the reeds in the foreground and his reflection is not visible as a result. It just distracts my eye as I look at it. I would prefer to have a completely unobstructed view of the bird and indeed its reflection.
2. The water is not level - the duck is swimming downhill to the left! The image needs a CW rotation of a couple of degrees to fix that. Use one of the reeds and its refelction as a reference point for a vertical.