MAIN DOORS MUST BE VISIBLE

If you look carefully at the two pictures above, you'd notice that the main door is hardly visible from the road.  Why?  This can be attributed to the awning for the houses making the porch dark.  This is further compounded by the hanging plants at the front of two of the houses and the banner for the third.
In Feng Shui, main doors should be clearly seen from the road or street. Another reason why main doors are not visible could be because of large trees or shrubs blocking the view.  This will block the inflow of health and good fortune.

SOURCE: http://www.compassionatedragon.com/fengshui5.html