I really like the dining chairs.

Too homogeneous. You need some punch. Color on the walls like a soft green and maybe texture on the Windows like woody shutters.

I agree it needs some punch! wall color, window treatments (simple and clean) and reorganization of accent pieces. like the books on the table, they don't have to be stacked so neatly. Also, a new light fixture. It's getting there, just needs some dressing.