I haven't sold a house but we bought a house this year and I've looked a ton of listings.
Make sure the buyers can see the house, not your stuff. Especially in the online pictures. Let them see the floor, the windows, the fireplace, the trim. So many houses had pictures online where you couldn't see the house itself at all. Let the light in, you can pick up cheap white, sheer curtains to brighten and unify the house.
As a buyer I would say make sure your pictures are good, many people search online for houses and if there aren't good pictures of the inside they may not make the appointment to look at your house.
The house we ended up buying looked ok in the pictures but in person felt so much larger and the light is great. The house that looked great in the pictures ended up having really small bedrooms, a low ceiling in the basement and an odd layout. But I think the people selling that house did a great job with what they had, 4 kids in a tiny 3 bedroom house but it was really clean, no clutter with nice online pictures.
Also make sure your listing is accurate. One thing that really annoyed me is when the picture of the house showed a driveway but then later I found out the driveway isn't part of the property at all and there is no off street parking. That may not be an issue for you but make sure the listing reflects your property.
Get your real estate agent's opinion but also some honest friends or family over. It is hard to see stuff in your own house because you get used to it being that way. Also ask about smells, you can't really smell your own house.
Melissa- mom to a boy 9/06 and a new boy 11/10 and married to my best friend 7/02