If you want to highlight the staircase wall then your could use earthy colours such as a yellow ochre! The wall could be enhanced even more by using suitable frames and making a good collage composition for all the photos that you have (I can see many lying on the dining table). This colour would match well with wooden furnitures

It has a descent lighting. I like bold colors. and this is a living room still in construction. The room has rectangular shape, this is half of the room. There is window on the opposite side of the TV(my back side while taking the above picture). The window size is 6 x 4 feet.

mostly Indians uses brown varnish paints for their main wooden doors....I even don't know why they didn't use other colors...even in my house doors are given brown color wooden texture...

Hi, I would suggest removing 2 of the units of the main cabinet below. The void between the full unit will add an extra dimension in the overall look and feel. Also, removing the moulding that runs across it should help. Since you plan for a wooden flooring complimenting it with white glossy finished shutters and a soft backdrop wallpaper could enhance the look. To complete the picture, you can think of investing on a large painting / wall planter in place of the uprooted wooden box. Hope you find any ideas useful. Thanks