What's on the window sill in the second photo? (Air freshener??)
More air freshener in the third (kitchen) photo??
The poor, abandoned and unloved bed in the fourth photo is sad (couldn't the estate agent even pull the duvet straight for the photo?). I would remove the Lightning McQueen freeze and wall stickers
Remove the pram and dolls from the fifth photo
Where does the bed fit in the loft bedroom? Needs to show the lay out of the room and how much bedroom furniture fits in there (if you can't comfortably fit a double bed and easily access the wardrobe, it will really put people off)
Inject some colour into the garden. Are those bark chippings in the middle? I would expect them to be covered in weeds (and fox poo) pretty quickly so would be mentally adding in the cost of re-doing that. Why is there some abandoned picket fence in the corner?
Needs dimensions on the floor plan
Ultimately if you aren't getting viewings it means that buyers think that it is probably over priced. How does it stack up to the competition?