Image details:
Tadoba Andhari Tiger Reserve, India. This is a full frame image. Handheld.
Canon EOS 1D Mark II, EF 300mm f4 L IS USM, ISO 800, f4, 1/160 sec. Full frame image.
Saby, firstly, with regards to your B&W version of this image, congrats on reaching the semi's of your photographic competition. I feel this has much more impact in colour, and he stands out very well against the BG foliage. Good direct eye contact, and I would consider maybe cropping some off the top to form more of a pano crop, to suit his lying posture.
There needs to be more space in front of the tiger and less behind him as mentioned. Setting the tiger in the frame this way gives it a very crowded feeling in front.
I like this one better. It really gives me a sense of jungle habitat with the BG bamboo/bushes. Might need a slight boost in contrast but not too much. Congrats on your competition.