I would put it on the wall behind the dining table, turned the other way to how you have it in the other photos. Take the small pics away from that spot and away from the wall near the christmas tree corner and group them all together on the wall between the 2 windows. find a large piece or 2 of art for the wall near the christmas tree. Thats what first comes to my mind to do. Its not to busy at all, Brandi is correct, the pictures are too small to be so far apart on a large wall.

It looks like the one Charlie Albone did was a plastic screen (Bunnings) adhered to a mirror. Im not certain what type of mirror he used. You might be able to find large acrylic mirrors through plastic suppliers. These would be suitable outdoors.

Before replacing your curtains as this can be quite expensive for such a large window, if they are in good condition, add a band of extra fabric to the bottom in what ever suits you, your existing curtain track can then be moved up to the ceiling for good looking full length curtains without the large round eyelets, could save you a lot of money, I would look at replacing/removing the sheers cheers

Where did the picture come from? magazine? if so, call the publishers, they may be able to point you in the right direction.