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

My first question will be: what is the utilities of this room? Who live in it? Age, gender? Is this room oriented by the North or South? East or West? What do you want to feel in this room? Serenety? Concentration? Spirituality? Energy? After all this answer it will be easier to help you. :)

First one will make the wall look cluttered. of the two above the one with wodden grains is better.

Hi, you can use the white shade quartzite for the counter. You can have a retro look and feel kitchen if you use turquoise or dark green or grey color cabinets. If you are going with this style then copper shade hardware will just be perfect.