The exterior of a house can almost look like you just painted if it is washed down. A strong nozzle on the garden hose is enough pressure -- stronger pressure (from a pressure washer) may be so strong that it causes paint to flake off.
Painting the front door and trim (doors, windows, porch railing, etc.) can sometimes make the house look so good that you can put off painting the walls for a few more years.
Replacing broken items on the exterior of a house (light fixture, mailbox, porch railing, etc.) will do so much for its curb appeal and value.
Before you replace or add any items, or before you paint, take note of the style and architecture of your home and others in your neighborhood. Mixing styles detracts from the look and value of the house. It is also possible that the past owners
removed or altered features. Any new work should keep or restore the original style.