If you go white use BM White Dove...very pretty

Greys can be tricky and "read" so very differently in one space to the next, depending on the light. Dulux Raku or Malay Grey may be worth a look for deep tones. Also, check out the colour atlas at the paint store as it will give a lot more choices then the display of sample cards or brochures. This will also tell you the Red, Green and Blue value (RGB). You'll want the blue value to be less then the red to get a warm grey.

You can choose chairs either to match the curve of the table or the diagonal, chunkiness of the legs. Though that timber is going to be difficult to match. I'd go metal. You can contrast it with slim legs or go with the chunkiness .

Hi, your chandelier is fabulous, these chairs from coco republic would look great, even a wishbone chair , go for large artwork on wall to add a stylish modern look, you could change the frames on your current art to a narrow black frame to give them a completely new contemporary look and really highlight them.