I thnk this is do-able with strips of plywood (probably 1/2") cut to desired width and glued and nailed to wall. Separate strips with nail spacers. Add simple crown and corner moldings and also high baseboards to add that vintage cottage feel.
bedroom, in order to feel relaxing, needs to be bright. This doesn’t mean you should use white furniture exclusively. Traditional, dark-stained furniture can be just as beautiful. In this case, the contrast between the light and dark tones is very beautiful. The decorations are great accent features and the most interesting is the mirror.