I'm trying to recreate a room interior and am modeling the basic structure. I'm having trouble modeling the arches in the interior, and have tried a view different approaches. The arch in the middle was created by joining a bezier curve to the mesh and extruding. The side archways were created using a boolean model. In both cases, the result was a very blocky style arch. I've tried subdiving the bezier curve before extruding it from the mesh, but it still results in a blocky arch. I'm not sure what the best approach is to this problem. I've tried using loopcuts and a subdivide modifier, but I don't think that's the best way to model an interior... Any suggestions on how I can keep the rest of my interior flat but smooth out the archways?
Also here is the reference image I'm going for: