The first picture is very confusing as there appears to be two front doors but the floor plan shows one entrance in through the kitchen, so the door off to the side. Can you put some large potted trees/plants in front of the non useable entrance ?
Fourth photo and the third , make the lounge look like a corridor , can you paint the doors into the extension white ? Your eye is really drawn to them.
Kitchen is a good size , but are there bulbs in all the lights ? seems quite dark and doesn't look like all the lights are switched on.
Extension/dining room, get rid of the table cloth, the orange and blue mats by the door and the heater and whatever the yellow thing is. Basically declutter and switch the lights on for the photos.
Main bedroom , declutter and get a valance for the bed, headboard if the budget will allow. Curtains or voile pannels for the window.
Bedroom with gaming chair , get rid of it , get rid of as many stickers as you can , fix the curtains.
Pink bed room , get rid of the fan, pictures off the floor and let the curtains hang loose.
The Garden , paint all the fencing, decking and shed etc , it just looks a bit unloved , move the toys etc, maybe get some flowers/plants etc.
Are you paying any estate agency fees ? because I would be really miffed if I was and they hadn't tried to encourage you to make some minor changes before taking the photos.