Nice sharp image of the dragonfly. The perch looks a little too big. May be cropping a little from the bottom may put the emphasis on the dragonfly. Interesting patterns in the water, which I think adds to the image. I don't mind background as it is.
Ravi, I agree the rock is relatively large, I must admit I did consider cropping but I wanted to show the dragonfly in its environment. A simple slice off the base as you suggest is probably a good idea.