We recently sold our house (well, currently STC). Tips we picked up were -
Depersonalise. A few nods to your lifestyle are fine but lots of family photos etc are a no
Declutter. Clear kitchen counters, coffee tables, dining tables, work space etc
Beds made nicely
Remove toys or store them, same for pet stuff, washing etc
Make the front of the house look more inviting if needed. Ours was a slapped arse. Lick of paint, trim hedges, potted colourful plants, move bins, new doormat etc
If you have any selling points, eg a lovely fireplace, try to make that a focal point if possible
Fresh flowers, nice cushions or throws are good for staging
It sounds twatty but basically try and make it "aspirational". Any rooms which currently don't have a clear singular use (our spare room was part office, dressing room, dumping ground) dress them to look purposeful to give viewers an idea of what they could do with the room.
If there's anything you love about your house but isn't obvious from the photos, tell the agent. Our garden isn't overlooked at all other than our next door neighbour. not bad for what many would consider a FTB house. You can't always tell this from photos so it was put in the description.