For me, a home that looks clean and light is important. I also need to be able to see the space.
Yes to neutral colours, clean carpets and decluttering. Staging is not important for me.
There is a house for sale near me and I had a nosy at the estate agent's details. I happen to know already that it is a 2 bedroom house with the owners' son and children living there with them temporarily, so I can understand the clutter, but quite honestly there is not a chance in hell that I would go to view the house having looked at the photographs unless it was very VERY cheap, which it isnt. Every surface is cluttered. The kitchen is small, but looks smaller because there is so much 'stuff' on the surfaces. Quite frankly it makes it look as if there is insufficient storage space. I already know, from my own house, how small the kitchens are (mine has been extended) but had I not already known the photos make it look even tinier. Every surface in the bathroom is covered in stuff, you can't actually see that it is probably quite a nice bathroom underneath. The primary bedroom is nice looking, near and tidy, but the children's room has 3 children sleeping in it with open storage, and things spilling out of it. Their father appears to be sleeping in the conservatory.
This is a perfectly nice 2 bedroom house, with a large garden for the area, a nicely planted front garden and a garage, but it is impossible to see how nice it is from the photographs.
So - my advice is - declutter as much as you can. If you think you have more furniture and equipment than you need, put it into storage (or a shed or garage) so that prospective buyers can see the bones of the house. Tidy as much as you can away. If you have open storage, buy boxes or baskets that fit in it to put your things into. Except bookshelves or display shelves, that would just be silly. Tidy books on shelves. Don't have too many things on your display shelves.
Clean your house, and keep it clean. That includes paintwork. If you have anything that needs fixing, fix it. No non-working lights, broken windows, missing doorhandles, drooping curtains or blinds etc.
Tidy your garden. Your home and garden need to look loved and well kept.
Everybody has their own ideas of what kind of decor looks nice... I tend to towards the colourful. If you have anything that is very different then best to neutralise a bit if you can, but anyone that has an ounce of sense can visualise their own colour schemes in a house they already like the look of.
Your pictures should be fine, but if you have anything which could dock or distress a buyer maybe replace it with something generic. No boudoir portraits. Best to avoid nude life studies. And I would remove the family photos, but not everyone would. I can't stand strong smells so scented candles, reed diffusers, room sprays or dog would turn me right off.... but you can't see those in a photo.
Basically, clean, tidy, uncluttered, well kept. If possible, get a trusted friend in to give you their opinion - provided you think you won't take offence and thus lose your friendship. Take your own photos and try to look at them with a prospective buyer's eyes before your estate agent takes the pictures.