sooooooo clean looking Interior Details. Herringbone floors & white walls with molding. This is exactly what I want in my future home! White furniture and white walls with subtle detail to keep it from getting boring.
grey & white Interesting that the crown molding is painted gray to blend with the upper portion of the wall. This is a great Tim to avoid "boxing" a room by painting upper and lower trim. Either continue ceiling color onto upper, or wall, as here.
I do not think you can go with a larger newel post. However I like the idea of the stained treads + handrail + cap on the newel post. Keep the newel post + tread + stringer (trim) white. This will look sharp!