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

Consider Grey or white. U could also use geometric or any pattern in mint green

Hi Sheeba, Your could opt for wallpaper or cladding or texture walls or paneling as mentioned above. You could also consider putting frames around the TV, changing the light above the TV to a beautiful wall light and adding a plant (real or artificial) in the corner. This is an option if you don't want to spend too much money and want a simpler DIY solution. You could also upgrade your TV unit. Here's an example! Best Reema CUBSpaces Team

Hi,  An oversized painting / wall mural / traditional wall art (you may choose state specific on this one) should highlight the volume and height of the space. Additionally, good lighting - wall scones / chandelier will add to the beauty. Hope these tips help!  Regards Ar. Manjusha Adhav - Kamble