I think before you do lots of expensive work on the house, you should do some totally free work on the listing. Fire your estate agent and get someone who can use a digital camera, for a start!
Like a lot of people on Rightmove, I tend to click through the photos of anything I am casually interested in - I don't look at the floor plan and details unless these are convincing. There are not enough photos for a house that size and price, and many of them are from odd angles that don't do the rooms justice. I would have no idea from them that you have an en suite bathroom, for instance.
They are clearly just taking everything from an angle to the side, and it makes your rooms, which are lovely, look bad - there is no focus here on the details that you have, which are fantastic. For example, the photo of the second bedroom is half of a desk in the foreground, which makes the room feel smaller than it actually is. The photo of your kitchen doesn't show how nice it is, and the garden looks like acres of patio, instead of a low-maintenance and quite large space that has potential. Get the sofa out of the third bedroom and put on a more colourful duvet and it will look loads bigger!