Always tell us where we are. And don't just tell us where something is, make it pay off. Use description of landscape to help you establish the emotional tone of the scene. Keep notes of how other authors establish mood and foreshadow events by describing the world around the character. Look at the openings of Fitzgerald stories, and Graham Greene, they're great at this.
Janet FitchRemember...we don't see objects, we see light. [...] Light can do anything water can do--flow, wash, trickle. It can do anything an artist can do--paint, burnish, carve. Candlelight falls, licks a face. There is always light in a room.
Janet Fitch