Love this house! Here's my $.02:
Paint: you didn't really ask, but I'd suggest that you make the roof beams all one color, and have it match whatever they're painted inside. Personally, I'd go with a dark brown but it's your call, of course. I'd also paint the fence to match the dark green of the house.
Sculpture: I think this is a great idea. Have you seen the sculptural pillars by Malcolm Leland for Architectural Pottery that Vessel USA has reissued? I think a few of those in the front would look great.
As someone who's only lived in houses in Hawaii and Southern California (I've always lived in apartments in colder climes), I can't really comment on plant choices for your area. But it strikes me that the photoshopped version of this looks very "Palm Springs" and I'm afraid that the gravel would get to be a mess when trying to rake leaves or shovel snow off of them. I'm sure you can judge that better than I can, though.