My first thoughts were that the living room looks tiny. All we see is a TV and a sofa - do you have another sofa or space for one near to the patio doors? We don't see a shot of that part of the room so at face value it looks only like you can fit a two seater in there and it looks nowhere near big enough as a family home.
Kitchen is far too shiny. It looks like every horizontal surface in there is reflective, including the floor, which gives a cold, clinical look. It somehow needs softening and making more comfortable. I really don't like the black gloss cabinets and that would be a major price-drop or walk away factor for me due to the need to replace the units. Do you have any other dining space? It looks quite cramped as a kitchen diner from the photo - table pushed against the wall - how much space do you have when the table is pulled out? Could a family comfortably sit around it for all meals?
The conservatory looks cramped. Either take out a piece of furniture or repurpose the room. As it is in the photo it looks like you have to squeeze past furniture to get out of the doors.
The bathroom that's shown is a little dated but wouldn't put me off as it's clean and in good condition.
The garden would also be a big off putter for me. It's very stark and empty with those slabs. The blue fence and shed is quite jarring and there is nothing which would invite me to spend summer evenings out there.
Remember that you're selling a lifestyle with your house. What I'm getting from the photos of yours is that it's small and shiny - so lots of cleaning and upkeep to keep it that way - and that you don't use your outside space at all. Personally I don't get a comfortable, cozy and relaxed vibe from your photos. I feel that it lacks comfort and warmth.