Use sensory images, yes all five senses, when describing the setting. If describing a cave, don’t just tell us it has rocky walls and cold air, but have your character touch the wall – is it covered in moss? Is slime flowing in rivulets down the rock to pool on the floor? Is the air dank and musty, choking her? Don’t overwhelm the reader with too much description either, sometimes less is more. Find a happy medium.