FWIW, I think the inside of the house looks nice- the kitchen looks nice (if small), I like the open plan living space, and it's generally well presented. The bathroom doesn't look brilliant, but it's "fine".
If people are booking viewings, but then not showing up or cancelling, I don't think it's the photos as such- I think it'll be down to something cheaper coming on the market, or them seeing something else and offering. Or will people google the area etc and find something to put them off?
How organised is your estate agent? I'm currently looking, and I'm finding some don't confirm bookings, or don't call back to confirm etc, which can lead to no-shows. It certainly doesn't feel like estate agents are keen to get me through the door- they'd rather pressure me about mortgages etc!
You say the property over the road is on for less, but hasn't been extended. However, does it have any features that are plusses compared to yours e.g. bigger kitchen, nicer upstairs bathroom, more off road parking, bigger garden etc? That said, your current price does look comparable to other properties that right move is saying are in the same area.
The final thing I'd add is the advert still says a guide price of 220-230k. If the very top end of my budget was 220, or, say, 215, I might be put off viewing because I'd wonder if you'd accept an offer of 220 or not.
How desperate are you to sell/move?