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 gave a pics of my house walls pse gave me suggestions which colour paint best house wall outer and inside the living room.

We are located in the Pacific Northwest and want to update our office and shop. Inside our walls are tan with tan tile and the horrendous golden oak doors and trim.

Either, you can paint all the walls with light grey or white colour. Or, highlight one wall with light grey colour and rest of the walls can be white.