I have to agree, staging would really help. Perhaps going through realtor they would take the cost into final sale? If it meant selling this month instead of 6, it would be very worth it.
I really think people were for example picking out the ceiling fan because there was nothing else to focus on. I know you are so done with the house, I have been therr, but a few touches would help. Is there a neighbor you would trust to add a fake potted plant by the front door, towels to the bathroom, a shower curtain in each bath(to play up the number of bathrooms) a low bowl of fake fruit or something in the kitchen?also there is kind of a cool cast to several photos, the walls almost look greenish in a few. At the very least could they adjust those photos to look warmer?