1. Build staircase, walls, foreground pillars. Create a really great looking marble floor pattern for the top shot. The two staircases would frame the fountain nicely.

2.

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4. Ceiling too low?

5. A bit too simple.

6. The wood isn't very nice, also room too narrow.

7. Having a luxurious long chandelier hanging down the stairs is very "in" at the moment! Would make a nice foreground piece of dressing for the shot of Mother going down the stairs, met by Son half way down?

8. The architecture is a bit messy in this house.

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10. A huge mirror would be nice, to reflect Mother coming down the stairs and see a glimpse of the fountain before the reveal?