Dog pen. For me that screams that there is likely to have been a (probably untrained, people-unfriendly) dog living here that couldn't be trusted to be left to roam the house or garden unsupervised. I'm also imagining a hosed-off-weekly concrete corner of the garden where dog poo has been accumulated. Yak.
Green shed is massively dominating the garden in that position. I'd be considering moving it well away from the house as it's obstructing the view of a good chunk of the garden.
First picture on the listing seems to demonstrate that house is awkwardly overlooked / crowded. See if you can get another pic taken a few metres to the right without the next house back in view.
You need a floor plan so that folk can work out what's what. It's not a typical 3-bed property, buyers need to know what's where before considering a viewing.
There's lots of different shades of wood in the house, you probably wouldn't see it as much if there was furniture in. But I viewed/bought my house unfurnished so I wouldn't have thought that made such a difference. Take down the plane, tidy the curtains, get some better pics taken that aren't the fish-eye type. Rooms without pics instil all sorts of 'what's she got to hide' vibes.
It's always the price. No idea about your local market but bungalows attract a considerable premium so you're not comparing like for like. It will sell, eventually, it depends how much you want to reduce it by.