I posted a while back re: a friend who was trying to sell an estate and getting a lot of negative feedback.
I cleaned out a couple of the rooms virtually to show what less clutter can do. This isn't photoshop so the results are kind of crude:
Straightened up bathroom:
Lightened up dining room and removed desk:
Tried beige carpet in master bedroom:
I think this may convince that the house at least needs to be emptied or mostly emptied. I don't think parts of it have been painted ever (since built) but I don't know that I would cheaply paint the entire house, I would probably lower price.
One of the other things I noticed looking at all the comps in the area is that the picture quality is also poor, and these weren't provided by the sellers they were take by the agent or a photographer. But they are all dark and not well composed even considering the given conditions.