It looks lovely to me.

It's fine.

You could add seat cushions with color that pick up the off white of the table.

Multi color place mats?

Beautiful!!

It's great! I would replace the chairs or paint them black. That will give you some contrast and pick up the black on your range and your overhead fan. Your table light fixture is really fun and adds a great touch of whimsy.

I think it looks perfect as is!