Since you want to make the foyer and open space bright, I try to minimize the use of walls as divider in the open space. Instead, we divide the space by using variations in the ceiling height and finish.
The open space is divided to two parts, first the dining area consisting of kitchen set - island - dining table, and then the second part, the TV area consisting of TV, sofa and a fireplace below the TV.
For the master bedroom, you get a walk-in closet with dressing table (see images), and you also get a big mirror between the wardrobes to make the room looks double bigger.
For the master ensuite, I don't change the position of the WC/bidet because its difficult to change plumbings, but I change the bathtub to the jacuzzi. In order to do this, I need to change the door position of the ensuite. I also put a big mirror in the ensuite to make the room looks bigger.
So how do you think? If you like the direction of the design, we can discuss the detail later. Please don't be shy to give me some feedback/changes :).