If it's a small space with limited lighting, I would think about leaning towards a lighter color for the other walls to maximize light. Because it's a dressing room, you want to make sure that you are able to see well. To really draw attention to the wallpaper feature wall, you could use a warm off white or a warm light gray. I would avoid a powerful color for the other walls as it would take away from the feature wall. Hope this helps!

grey and a red rug
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