I'm on rightmove everyday looking at houses, I would suggest:
Clear your work tops in the kitchen.
Iron your bedding is a HUGE one. The amount of photos Ive seen where the bed is all creased makes it look grotty.
Clean towels. All matching if you can
De-clutter!!!!!!!! Try and get as much stuff out of sight as you can. You want people to see past your stuff and see the house itself
Take everything out of your bathroom. You want a nice clean, tidy and appealing bathroom. Remove your shampoos, bubble baths, bath mat.. the lot! Matching towels if you can or at least towels which are clean.
I know it's not always possible but try and look at the weather forecast and arrange for the EA to come on a sunny/bright day! It makes a world of difference to the photos.
Fresh flowers always look nice and homely. See what the room looks like with lamps on? It might look better on for the photos? See which is best
Just have a look round your house and try and see from an outsiders point of view... anything which might make someone raise their eyebrows might need removing or changing
These are pics Ive just pulled off rightmove of a random house. I would be so deflated if I was an EA taking pics like this
I hope the owner isn't on MN.