Wildlife photography is perhaps the most challenging among all the branches of photography. One can add war/conflicts photography as well in that bracket as one can get shot while capturing images.

How much crop is this? And crop from where?

I agree that eye contact with the tigress would have been better.

Both the tiger as well as tigress do scent marking. There are 41 different chemicals in the liquid ejected during scent marking. The purpose of scent markings can vary. How many times did you see her scent marking?

Some details about sense of smell: Tiger: Sense of Smell - Flehmen Response - Indiawilds: Land of the Tiger. Conservation, Wildlife Photography, Communities

Cheers,
Sabyasachi