How about a piece of art and a chandelier?

@ilikefriday would u do one panel art or multiple?

Some type of wall decor or art centered under the downlights adjacent to the wall

Do you have any hobbies, interests, or artwork in other areas of the home you could carry through to this area? What is your "style"? Looks like a large space with no area carpets also - could a tapestry help with absorbing some sound?

A gallery could be nice.

Wallpaper the stair wall. Choose the color scheme to work with the floor and railings.

Consider painting the doors black.