Hi Ajith,
Great photos. I like the color treatment - it builds an atmosphere.
Photos #1 and #3 look like they have some darkening in the upper right hand corner. I would really like to see #2 and #3 with a lens correction applied so the edges of the buildings are stright. It might be fun to do some PS on #4 and remove all but one group of people (leave either the 3-person family or the guy on the chair).