It is not a plus for you if a potential buyer doesn't like the outside look of your house.So you can go outside and take an objective look at it.Check evrything in details starting with the front door.Clean the garage and the shed and put everything inside in order.Do not miss these places as they are an importnat part of your property.Have in mind that the buyers will look all around your house,they will not miss even the loft.Trim tha lawn and arrange the flowers.Clean and repair the driveway.Check if the doorbell is working ,"listen" for creaking doors and windows.Paint the windows if necessary.Have in mind that if you leave all the above mentioned in a bad condtion this will be a sign for poor manitenance and the buyers may refuse to make the deal.In reason to avoid this failure put everything in order and make your house looking perfect form outside to the back door.