The idea and the colours are very good, but I think, the problem is the composition and the framing of the subject. There is no real need for the waves on the bottom of the picture and the heron is a bird, which looks good if there is some space over it’s head… I think, you tried to take two pictures and not concentrated on your excellent idea enough. Why not crop it at the dark wave half way from the bird to the bottom and on the right hand side? Perhaps you would need to play with rotating cropping it…
I can’t really add much other than I tend to agree with what the others have already said. I think having the heron lower in the frame with more empty space above it would work better compositionally for me. I think there is a really great image waiting to be made from the way you’re thinking, just not quite there yet.