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.

Wall- use mirrors to reflect what you want to see, it will provide more light and hopefully the illusion of space. Can you put it on landscape orientation on the wall?

Where are you hanging it? What is the wall like behind it?

Thank you everyone! Between you all you have summed up my concerns (changing bulbs, enough detail already in the stairwell, honouring the old house) and my desires (a nice lantern pendant or period light, LEDs need less changing, overhead lighting. I like the idea of the wall lights but we have not wired for this. There is wiring for for stair lighting (phew, glad we got that right) and one down light in the middle of the void. We have reconsidered a pendant as the one down light will be harder to change but are worried about obscuring the windows. Perhaps one of the simple fine-framed lantern pendants or white vintage light, on chains will be easier to change as we can pull it across to the stair, or a pulley pendant like this I'll post some more photos of our reno once its further on.