Mow the lawn, weed the garden, trim overgrown shrubs, pick up toys and other articles in the yard. Paint, if needed. Repair all exterior damage. Other nice touch is to get rid of the old dirty doormat and get a new one. Clean the house Now take a good look at the inside of your house.
Most people tend to get comfortable with their own mess.
To a stranger however, a newspaper left lying on the floor can make a place look like a dump. Clear shoes and boots away from the door and put them out of sight in a closet. Don't leave dishes in the sink or on the kitchen counter. If the walls don't need paint, at least wash off smudges. Repair Repair all interior damage that will spoil appearances and reduce the perceived value of your house.