I love the posture, red beak and large part of the water body filling the frame giving it a nice context. One interesting observation from processing some of my such images dominated by space so far has been it takes lots of time for me to get the amount of space that is just right for my taste related to main subject (like in this case tern). Too large will decrease the visual impact on the main small subject in the frame while smaller crop will adversely affect the mood and context we wanted to convey. I am sure lots of it is personal. Interestingly even 5-10rows of pixels makes lots of visual difference - I often end spending lots time for such compositions. I tend to think about 10 pixels deep crop left and top would add to this composition further. Thanks for sharing..

Thanks Ganesh for oyur views. I will try to recompose the image and post it on illustration forum.