Nice picture Abhirup. Most of your pictures are quite sharp inspite of a low shutter speed and low ISO (with the exception of the tufted ducks).

Maybe you should experiment the same shots with higher ISO as well which will give you a higher ss and even more clarity and an even more wonderful picture.

In this case a lower Aperture will also help with a hazy DOF effect on the background.

Agree with Mrudul on the space at the bottom and thanks for sharing

Rajan