Check out WallDeco-Life-var-107 room with arched window and wallpaper 3D model on CGTrader for $9. High-quality mesh by notfun: 100 polys, 100 vertices. Textured, UV Mapped.
STL (Stereolithography, filesize: 1.64 MB), OBJ (OBJ, filesize: 1.64 MB), FBX (Autodesk FBX, filesize: 1.65 MB), MAX (Autodesk 3ds Max, filesize: 1.7 MB)