Really like the counter top combination. To create a finished look (rather than a haphazardly thrown together look), you should probably use the same color on both vertical spaces -- the same color as is between the diamond shapes on the wall.

What a beautiful house, Shahbaaz! I live in a similar house - a 150-year-old colonial bungalow in Kumaon. You have already received lots of excellent advice from better-qualified people, so all I would say is, keep its age and heritage character the central theme. The white tiles do clash, I am afraid ... flooring with terracotta tiles would echo the roof and look lovely. The columns and the arches over the doors and windows are amazing. But I'd say, leave it all chuna-painted - there's a beauty and softness to it. Don't let the painters add too much neel (indigo) in the limewash -- in the hills where I live, they put far too much if I don't watch out and the result is a harsh white. Natural lime has a softer, creamy look.

that is what i have added if you can see the pic above.. want some suggestions on partition that i can use between dining and sitting

The orange is actually interesting and many people are adopting a wacky and young look for their office. I will suggest you to break the monotony and NOT go for grey or warm wood colors in the office since these colors make the space dull. You cn go for matte white laminates on the cabinets. With black and white pattern paintings/decor.