Give attention to hardware in the room. The switch plate cover for instance should be attractive. This gives a sense of quality. Especially in the foyer. If you can’t afford to replace your switch plate cover that’s okay, just make sure that it blends in. If the walls are painted, paint it to match. If they are papered, well you get the idea.
In a small foyer maximize the light and make a tight area feel less cramped with a floor to ceiling mirror. Your foyer may be a tiny space with only a coat closet and no place to hang a mirror. So why not mirror the closet door! This will make your space appear larger. Depending on how your closet door is positioned, it may double a gorgeous view of the outdoors.