There is contrast between the traditional furniture and the focal point of the floor which pops, draws attention. I would recover the sofas in cream colored soft fabric - suede. I would leave the curtains grey, and put down a large neutral area rug. The edges of the room would show the pattern of the floor. I would color the wall and add texture to it, but not too dark as the room will appear smaller. Add a picture and put a nice plant holder, large vase in the left corner of the room - an oriental-style vase. Or, a cream-stripe fabric on the sofas. You could go soft or bold in this room - depending on your taste.

Hello Dinesh, What about looking to the landscape for inspiration. That mound of earth is a beautiful colour.. For me I'd be thinking of a textured block exterior (look at Frank Lloyd Wright) for inspiration here in an earthy colour with a lot of beautiful plants suitable to the climate. So the facade takes in sun and insulates at night.. You can then have window screens to keep the sunlight out and the interior cool during the day. :))

a beautiful landscape with a small stream...

Just because you want to use the space below the stairs, do not just add drawers or shelfs unless you reaalllyyy need it. I would suggest go for adding something green to your house. Its healthy by adding air purifying plants. These plants are nowadays available in most of the nurseries and moreover Green patch in the house gives a beautiful look to the house and is also good for eyes ( the green color). Below are few picture to motivate you for Green patch or Indoor garden.