Thats terrible advice. Gravel and Astroturf are hideous and environmentally destructive. I would be so put off by your dead, ugly, weedy garden.
The worst bit is the tarmac-filled flowerbed. What on Earth were you thinking? It doesn’t even match the paved drive, it’s just a horrid semi circle of black that will be really hard to get rid of.
The people who like dead gardens like them because they have no plants and are exceptionally tidy. You’ve got the worst of all worlds with an untidy dead garden that will appeal to no one. You must get rid of the weeds and fix your fence. From the ugly front and lack of back garden photos, people will assume (correctly it sounds) that the back is a hellscape. You ought to replace the lawn and put some cheap bulbs around the edges and in pots.
The inside is nice, but grey is outdated now. If you paint the fireplace, bannisters and feature wall upstairs a different colour, it will look less “millennial grey”. Unless you’re going to replace the carpets it will have to compliment the existing grey, so maybe a soft mid-blue tone or plum would work.
If you fix all those issues then have new photos taken, it should be more attractive.