I am guessing that you want some kind of separation between dining room and kitchen? You want to keep steam and any oil in the air, from cooking, out of the dining room, stopping it at the ceiling with a wall but keeping the dining room open so the light from the large kitchen window can filter into the dining space? If I am right, the shape of an arch would best match the architecture of your house or of these rooms. An arch is an architectural element as well as a design element. It is possible though that an arch will be totally out of place in your space when a cleaned lined separation would look very nice. Hard to tell. Can you post a picture or give some verbal detail about the style of your spaces?

I'd go for make it white; then right there, flop one nice little white overstuffed loveseat or something that fit, or one big whopping chair, and fit in a tiny table and light; treat that corner as it's very own micro-retreat, and the seating is to not face out into the room. Like little lounge spots put under stairs, make this one dedicated to the view; and make it minimal. Decorate the rest of the room as if the column and retreat bit isn't there.

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my narrow plot size 22'6"_94'at corner front south road and East side back road,want house design 2bed,garej,bath,kitchen, front space, within 1100_1300 sq ft