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.
Are there provided pictures??
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