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

I have a pair of leather sofa. Our new living room needs some ideas. There is a big window. And the room is big too. I have a black coffee table as well. the cushion of the sofa are beige colour with grey stipe. What colour should we paint in the living room? what colour of the tiles should be?

Paint ceiling with white color Have perpherial false ceiling , install strip LED lights , this way you can have indirect day light .

Hi Sonia, the flooring does look good. For the walls, apart from off white, you could also go in for grey, the cool undertones. That will really enhance the overall look of the room and the beautiful flooring. Even darker shades of grey or olive green would enhance the look, if you are comfortable with slightly darker palette.