Some honest feedback on the photos. It's obviously a much loved home, so please don't take these personally - I say them as someone totally independent.
1 - no complaints - really nice kerb appeal - actually looks similar to my house
2 - same - looks fine to me - again looks similar to my house - I have a very similar fireplace - I think it might be the same developer!
3 - Why EA? Why?? As a space, I can see past the clutter on the sides in the utility and the loo, but it really could do with being tidied. All it says here is that there's no where to store the pet food and cleaning stuff
4 - OK, so it needs updating maybe, but there's nothing too wrong with it. I'd move the machine on the right (beer??) to the utility room, and remove the stuff next to the microwave and on top of the cupboards. There's no view the other way to know what other space is like at the other end of the kitchen. No picture of the dining room?
5 - Really cluttered and a mishmash of blinds being open and closed. Use it as an opportunity to recycle some of the kids' toys, get some more Ikea kallax units to hide what's left, and have a general tidy.
6 - There's nothing massively "wrong" as such, but I'd have made the bed a bit neater for the photos and tidied away the makeup (even if it's just moving it out of the room for the photos.
7 - the peach walls aren't great - it looks really yellow from the bedroom. I could see past this though as a pot of white paint isn't much. It would be a room I'd do up at some point. Again, hide as much as possible in terms of the lotions and potions.
8 - I see from the floorplan that this is a second en-suite, which is lovely. There is no picture, however, of the main bathroom, which looks to be the one with a bath in it. Just looking at the pictures people might assume this is a 5 bed (i.e. family) house with no bath for the kids.
9 - No issues really - just would have made it a little tidier for photos - neater bed, corner and top of wardrobe clearer.
10 - Why?? OK, so this is what is classed as bedroom one on the floorplan with an en-suite, but it's not clear and it just looks like someone's taken a really weird photo from the landing.
11 - This is fine to me, though do add an extra hook to the left hand curtain!
12 - I'm guessing this is bedroom 5? There's no sizes on the floorplan, but the blurb make it clear this is almost too small to be a bedroom. You're using it exactly as many would, but the storage could do with being a bit more organised in terms of looking like it was meant to be there, rather than you've run out of space so bought some more plastic boxes.
13 - Or is this bedroom 5? Again, looks pretty small to use as a bedroom, but it's fine as an office. Again, perhaps just make sure the curtain hooks and rings are evenly spread along the curtain (this is being very picky!)
14 - It's a family garden, obviously, but I would perhaps move the BBQ and basketball hoop into the garage for photos. Put a couple of pots out with some colour in it and make it look a little more user friendly. I can see from the floorplan that it's difficult to find a good angle to take a picture of the garden. Whose fence is that on the right? It looks like it needs replacing. And the back?
Give the fascia above the conservatory gutter a good scrub and pull the blinds up in the conservatory - again, just for photos if they're otherwise needed down.
What's the garage like inside? If it's full, again you might want to organise it.
It's a bit of an unusual layout as it would make more sense to me to have a door from the kitchen to the dining room, rather than to the lounge. Not something you can change, but it's a reason that some might not be keen.
If you can't convince your husband to declutter and throw stuff away, can you rent a storage unit for a while and just empty a lot of stuff into it? If you're potentially downsizing though to a 4 bed, I would seriously consider decluttering properly though as otherwise you're going to have the same amount of stuff in a smaller house.
Ultimately though it needs a good sort through, new photos, add photos of missing rooms, add dimensions to the floor plan and possibly a new agent (though given they've already told your DH to de-clutter I'm thinking it's more of a DH problem than an EA problem)