The beds should all be made, and as wrinkle-free as a five star hotel. The entire space should be free of all clutter and overly-personal items, to allow the largest appearance, and to permit the prospective buyers to imagine themselves and their things in the space.
Even the closets of the bedrooms should be tidy and organized, with as little extra stuff in them as possible.
Any extra furniture should be removed from the bedrooms to give them a larger appearance.
Keep all surfaces clean and clear. Tuck extra little items away while potential buyers are viewing your home. Every little bit will count towards the overall clean and larger impression.