In film acting, you're on an actual set in a real location, and the set can even be moved to a whole different location. Also, CGI (green screen) and stunt doubles are usable. However, in stage acting, you must do your own stunts, and the set is build on a single stage and is not moved, and CGI cannot be used.
Painting in the renaissance was most commonly done as fresco or murals painted onto plaster walls. For frescos pigments were mixed with water and directly painted onto the wall. However some artists did paint on wood using tempera paints which are pigments that use egg yolk as a binder
To create the mood that your client want, you will need to EMPHASIZE THE EXISTING QUALITIES OF THE ROOM SINCE THEY SUIT THE DECORATING REQUIREMENTS.
From the description given in the question, it can be seen that the available room already has the qualities that are desired by the client, all that the artist needs to do is to amplify the qualities of the room by decorating it to the taste of the client.
