First of all, fix anything that is broken or makes the house look neglected. And that doesn't just mean the structure, but also the landscaping. If a once-beautiful bush is completely covering the windows, eliminate it or trim severely. Repair rotting wood and repair or remove messy screen doors that detract from the front door look.
Clean and Paint
Wash the porch and the front windows. Shine up light fixtures. Use a pressure washer to clean the driveway and walkways. Throw out broken flower pots and any other debris that may have accumulated in the yard. Stash the kids' bikes and toys in the garage or basement. Add a fresh coat of paint to faded trim.
Focus on the Front Door
The front door makes a strong impression on whomever comes up to it. Don Vandervort of Home Tips.com recommends painting the door a bright color that stands out from the rest of the house. Polish door hardware such as knobs and knockers and clean any glass on the door. If the hardware is old or tarnished, replace it.
Trim shrubs, mow the lawn and edge the beds and walkways. Plant colorful flowers in flower beds, window boxes, planters and hanging baskets. Michael Love of the New York design firm Interior Options recommends placing a large planter filled with flowers on either side of your front door. Put fresh mulch in the flower beds.