I love imperfect spaces (and people) - overly staged interiors photography bores me senseless. The English do It right. Note the “knackered” sofa, empty wine glass, threadbare rug on top of threadbare rug. It needs a dog or two, couple of chew toys,.
There's some interesting color combos going on in this pic. The muted green walls and the dark and glossy green door and the more lime green chair. Kind of fun to see so many variants of a single color.
Perhaps paneled wainscot or shiplap in the downstairs powder room? Beautiful powder room with wallpaper. Wallpaper is Crivelli Trellis BP 3102 by Farrow & Ball. Sconces are the "Alexa Hampton - Abbot Single-arm Sconce".