Nobody, literally nobody, is put off by a well maintained garden. However, if you'd allowed it to become as much of a dump as you've allowed the front to become then I can see where negative comments would come in.
The paint job on the front of the house is awful. It looks patchy, not sealed properly and doesn't look like the right paint.
The tarmac on the semi circle, apart from being a monstrosity (what the fuck were you thinking ripping out the nice plants?) is a really poor finish and looks very odd in contrast with the old block paving and the tarmac on the road.
Why have you removed so much kitchen worktop space and storage?
Honestly the more I look at it, the worse it gets.
I think you've got an awful nerve doing such a shit "renovation" and expecting £135k more for it when you've made everything worse than it was and haven't even changed the kitchen units (which incidentally looked much better before you ripped the cupboards out, added a fridge which is way too big for 2m of worktop and painted it that awful green).