Hello Ankur, greetings from the Critique Club!
Regarding your shot:
Composition
Very good closeup, the expression on the man's face is great, the moment is very well captured.
Technique
For portraits you should keep your aperture to a minimum, f/8 is a bit much for this, since you had to increase your ISO to 800, and this creates a bit of noise in your photo.
Processing
The sepia tone is very pleasing, and the exposure is very good. But I fail to see exactly how it was done, because you made the white beard and the skin completely without details. I'm not sure if it was too much colour processing, but you can see in the lower end the white / greyish tone of the beard, it's completely burned. Also his nose has lost definition, that I suspect is because of the colour conversion.
Keep trying to improve these points, and since the sepia processing is harder, you can try next time to do a b&w conversion, the choices are more simple.
If you have any questions feel free to contact me.
Regards,
Joao |