This is a great composition. However, the background is to dark for my tastes and the whites look rather hot. Was this image made in the evening? Did you use flash as mainlight?
I am a sucker for GBH im ages and this is wonderful with great interaction and I like it that you were able to capture the eye on both herons. I do agree about toning down the saturation a little.
Great interaction, sharpness and postures. Find the colours a bit contrasting, possibly because the light was already a bit harsh (?) I would suggest lighten the background a bit and tone down the whites.
Great work John - you have capture the moment beautifully, a real story telling image with impact.
Agree that the saturation could be toned down a bit but the BG doesn't concern me - it tends to emphasize the 2 subjects very nicely. Well done!!