Very nice Swapnil...the fading of the tone is complimenting the emotions very nicely.

Swapnil, not sure why, I always find reverse vignetting tough to accept compared to normal vignetting - may be because we are used to seeing normal vignetting - vignetting happens naturally due to limitations of lens, use of extension tubes etc, while reverse we don't get used to seeing much ? May be a little less pronounced would have added ?
Technically speaking there isn't a difference..

thanks nilanjan sir and ganesh sir , i just tried it in a less prononced way and it looks better. I tried it this way as found fading bodies complimenting the facial expressions of the baby elephant.