Clean and tidy, although if you got young kids, not unusual for this room to be slightly more cluttered.
Good kerb appeal. Buy some pots and put some pretty plants in it to add kerb appeal if necessary. Mow the grass, sweep the paths etc.
For photographs, do basics such as make the bed, empty bins, remove dog bowls etc.
If possible, put a posh car in your driveway for the photographs to make it more appealing.
Doesn’t have to be the latest fashion, as people will make changes. Also, I always think too many newly painted walls are suspect - what are they hiding?!
Fresh flowers, nice fruit in bowls for when people are viewing.
Make sure each room has a purpose. If a room has become a bit of a dumping ground, then repurpose it as a bedroom or office. Charity shops sell furniture really cheap if you need something cheap and cheerful.
i remember reading years ago, you should spend 1% of your selling price to do your house up for selling. Houses are a lot more now, so maybe not that much is needed, but you get the idea.