How do I make my house show better?

First, make your house look as clean and spacious as possible. Remember that people may look behind your doors - closet and crawlspace doors as well as those to the bedrooms and bathrooms. So get rid of all the clutter; have that garage sale and dispose of the remnants.
After you've cleaned, try to correct any cosmetic flaws you've noticed. Paint rooms that need it, re-grout tile walls and floors, remove or replace worn carpets. Replace dated faucets, light fixtures, and the handles and knobs on your kitchen drawers and cabinets. Finally, as with the outside of your house, try to make it easy for prospective buyers to imagine your house as their home. Clear as much from your walls, shelves, and countertops as you can. You want prospective buyers to be mentally placing their furnishings in the uncluttered space you’ve provided.