Your house is lovely and will sell. I love the stag paper.
Remove the entire picture of the stairs slide - it is overwhelming the room. Maybe take it from the opposite end of the room, or get rid of it altogether.
Get rid of the pet paraphernalia from the garden (just for the pictures - don't get rid of your pets, lol). Buy a really elegant bedspread for your double bed and put some cushions on - say 4, piled up, 2 + 2. Accessorise the living rooms (cushions, attractive vases, nice lamps, flowers, etc).
Get pictures on a more sunnier day and ask them to focus on the garden and not the surrounding area.
Finally, give the conservatory a real wow factor. Put a table in the middle and dress it for the pictures - matching crockery, glasses, napkins, candles, centre point. Think a lovely wedding table but scaled back. Really go for it. It will give the room a purpose, show buyers a proper dining area and entice the buyer want your lifestyle. (if your budget stretches, you could do the same with the garden - table, fairy lights, etc). A few changes won't cost mega monies - get a second hand table if necessary, using your own chairs.
Best of luck. Love your house. It is spacious and lovely layout with good proportions. Buyers will see that, it's just getting them through the door that is key :-)