The interior design of your home should  reflect the character  of the  'exterior design'.  A French, English or  Italian style home  should   have the period style moldings and other  decorative design details   inside to  complement the facade treatment.   Proportions of interior  arches,  ceiling  treatments, stairways,  paneling, etc. should be as  carefully designed as  like  aspects of the  exterior.  Architecture is  important, whether interior or   exterior  and should maintain a  stylistic integrity.