Any advice to make this room look improved?

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Wanting a wallpaper for a wall 18ft long x 7ft 6 ins the room is 12ft
I do not want to make this room look short there is nothing on this wall, patio doors at one end of room and no other window. The only internal door is on the opposite wall. Any advice to make this room look improved is welcomed, thank you.
The room is my lower floor lounge with access to the garden. The fire place and TV are going as I want is as a lounge. so a big wall to paper.
q wanting a wallpaper for a wall 18ft long x 7ft 6 ins the room is 12ft
The wall to paper is to the left of this photograph.

q wanting a wallpaper for a wall 18ft long x 7ft 6 ins the room is 12ft
This unit is being removed.
q wanting a wallpaper for a wall 18ft long x 7ft 6 ins the room is 12ft
Fire place and tv going
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