Focal Point - it's the antique dining table of my Granma

Harmony - color of the curtain somehow picks the tone of the dining table and chairs

Contrast - light color curtain was also used to balance orange and brown 

Balance - symmetry was achieved by using the same chair design. Asymmety was also used with the curtain

Repetition - applied by using the same chair design 

Scale and proportion - size of the dining table was perfect for the size of the dining area. Rug was also proportionate to the size of the furniture