You have all the reasons to redo the house, its very lifeless and looks worn out. I feel creating a separation will terminate the spaciousness of the room. Adding colours will surely help, Since you have a tan color sofa,I suggest grey, white or light blue color on one of the walls. Add some art works of the color you chose for the wall. This room needs some fillers like , books, throws, candle stands tall and lean. YES DON FORGET 1. Mount the tv on the wall make some space on the floor and Fix a large size mirror ( Wooden Frame if you can afford).

If you can't clean up the painted edge, you could always add a 1x3 piece of wood as molding. You can even carry it up to the ceiling to frame that wallpaper. I don't see that paint color in the wallpaper, or maybe it's a lighter version of the flower centers. Maybe stencil on a design using the darker color, or another color from the wallpaper to help tie it together. Then narrow floating shelves or vertical frames or something in the painted areas it you feel you need it. Maybe turn the bed around so the wallpaper is the headboard.

Thanks for ur advice guys ! Is there any other color advice ? Like brown n beige mix . Will it suit the high walls . I seriously don't have any idea as how to use the color . I tried a green on the walls in Photoshop . It looks totally lame but just want to know how to mix the colors . Any suggestion on how and where to use the color will be appreciated . Like dark color on the wall which has the TV and light color on all the other walls or opposite walls with the same color .. Pulling my hair out !!! I wanted to go for the black sofas only cos of low maintainence . It wil not get dirty soon . The one big thing under the staircase is my fish tank . The one near the wall is the TV . Yes we have fans attached on the walls . Since we have a high roof , we cant use ceiling fans . And the house is not equipped with a centralized AC . I just want a color which will helps me relax and will also look modern .

These editorials might give you some more ideas [https://www.houzz.in/magazine/amazing-alternatives-to-wall-paint-stsetivw-vs~75306943[(https://www.houzz.in/magazine/amazing-alternatives-to-wall-paint-stsetivw-vs~75306943) [https://www.houzz.in/magazine/7-ways-to-create-an-accent-wall-without-paint-stsetivw-vs~93195441[(https://www.houzz.in/magazine/7-ways-to-create-an-accent-wall-without-paint-stsetivw-vs~93195441) [https://www.houzz.in/magazine/10-ways-to-create-an-unforgettable-accent-wall-stsetivw-vs~77848631[(https://www.houzz.in/magazine/10-ways-to-create-an-unforgettable-accent-wall-stsetivw-vs~77848631)