Very hotel chic style~ If you want to keep it calm and serene I would repeat shades of lavendar/purple for some subtle dimension in your two-color scheme. I think it would add some more style to add a bronze vase or other accessories.

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some inspiration pictures for you :)

xoxo eva @ MONARCH SOFAS

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The furnishings you have already are so beautiful that you don't need to introduce another color range. There is enough pattern, texture and color to consider staying with off white for a small really beautiful group of candles and just one or two ornaments. You have achieved calmness and elegance, I would suggest keeping it that way. What pictures do you have on the walls?