For starters the photos all look like they've been taken from the angle of someone crouching on the floor. They're awful. You get no sense of the size of the rooms - they cut off a lot of space and they particularly make the bedrooms look very poky. They all need redoing. Wait until a sunny day and get them all retaken by someone who actually knows what they're doing.
The outside looks grubby. Pressure wash the outside of the house if you can, or give it a coat of paint.
The garden looks unloved and I can't visualise how you'd use it. The angle of the photo, looking out from the house, emphasises how overlooked you are, which would put me right off. Take a photo from the end of the garden looking back at the house, get rid of the slide and washing line, which take up most of the lawn and make the garden look tiny, and style it like a little oasis - seating area, lounge chairs, fairy lights, etc - help people imagine it as being a place they'd like to sit and relax.
The kitchen is fine and a great size, but the table looks marooned in the middle and the sofa makes me confused about the room's purpose - if I were just quickly flicking through, I might think that it was the lounge too and you had no separate lounge. Get rid of the sofa and move the table to that side of the kitchen so there's more clarity about the purpose of the space, and also so that the space looks bigger.
Get rid of the office desk and chair in the lounge - you've already got a whole room as an office - the lounge needs to be a lounge and the full space seen as living space, not working space. It's a lovely lounge and you want to show it off.
Sort out the office. It looks like a dumping ground. Same with the children's bedrooms. Boxes and storage stuff everywhere which just makes the rooms look small and a bit sad. You need to stage those rooms a bit.
Your bedroom is lovely.
A bit of sprucing and some better photos and I think you'll be in a much better position.