I think it's a really decent sized house, even if the layout isn't completely conventional. There's no point in having a go at OP about shape and sizes of rooms, or certain large features (brick fireplace, conservatory floor, etc) as it would be way to costly to change and she wouldn't make that money back. I think tweaking certain things would be much more beneficial and achievable... these points have probably already been made, but this is what I'd do:
Remove the bins and wheels from the garden - even if it's just for the photos - as it will almost certainly put some people off thinking that they always live there (although this maybe true)
Paint the kitchen tiles a lighter colour to bring in some light and make it feel a little more up to date
Move the blue sofa and coffee table into the conservatory and put a big rug down (think relaxed lounge/playroom)
Put your dining table in the room where the blue sofa was
House plants, cut flowers in vases, rugs, and stuff on walls will make a huge difference even in bathrooms (big bathrooms like yours look great with plants in them!)
Good luck OP! I think it's a great house with plenty of space. I hope you get your dream buyers soon!! In the meantime enjoy your lovely home 