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How to decorate a long wall or hallway
Create a focal point on the long wall.
If you have a room that has long walls paired with shorter walls, creating a narrow space, it's best to create your focal point for the room on the long wall. If you try to place it on the narrower wall, the room will look even bigger than it already does.

Options are:
(a). For example, if you have a small room, such as a bedroom, use your walls as a focal point. If your bedroom has an entrance into the center, use that to make your room look larger.;
(b). A focal point can be an entertainment center or it can be a large piece like a painting. Basically, it's what the attention is focused on in your space.;
(c). Use a piece of furniture to create a focal point on either side. For instance, a simple couch looks great on this wall, and a large, deep rug looks great on your dining table, for instance.;
(d). Try to create focal points that create at least 1 vertical , 1 horizontal, and 1 vertical vision of the room. Fix your focal points to one piece of the wall.;
(b).