I would do the front railings, just as you have. They look very nice. In the back where you want to see the view, I would suggest the glass type.

Shutters on this house aren’t bad. The current ones look a bit too narrow, though. To look right, the shutters should be wide enough that they could actually cover the window.

As for color, I like green. Maybe a sage-y green for the house body and then a deeper coordinating green for the shutters. Keep the white trim.