I have no ckue where the wll is how it relates to the rest of the spaces so a floor plan to scale and pics of the spaces connected to the wall so we actually might be able to help.

Maybe unify the paint colors? Can't really tell what the issues are, and you haven't shown enough of the home to understand what doesn't coalesce, and what exactly you mean by that term.

Hard to tell what the problem is. Can you post more photos?

It's really hard to tell what/where this area is from the info you've provided. I would ignore it, especially the upper part....it doesn't appear to be something that you want to highlight.

Select items that start on the second floor and trail down to the first floor

If it were my house, I wouldn’t treat it all as one space. I’d consider the wall you see by that door upstairs as one area, the wall downstairs as another, and ignore the middle part that joins them.

I’m not in any way suggesting these specifics pieces; I only grabbed them to show an example of placement — two pieces on the downstairs wall and one piece on that upstairs wall.

Or, art on the downstairs wall only, and nothing at all upstairs. It just depends on what looks you like.

If you’d prefer a more gallery wall type of feel, Beverly’s framed art idea would work well.