I think I'd paint out the fireplace (probably white??), move the personal bits from the sitting room, find (borrow) a few throws/cushions to tie it together and take down the small pictures (they are all in a row) and use command strips to put up something bigger. And fresh flowers - white? Lose the footstool and have a rug and coffee table.
Can you store some kids' stuff in a friend's house for a while? It just makes it look as though there isn't enough storage.
The rabbit run will put many many people off I'm afraid. Don't know what you can do about that one.
Big bunch of white flowers or plant or something on the dining table - it doesn't look used.
In the office, hit the cardboard boxes, at least while photos are being taken!
I have no idea why agents take photos while it's wet outside! I'd ask for new photos without cardboard boxes and piles of children's books etc. And a different angle of the bedroom with the green furniture in it. Approve the photos before they go on the website.
Good luck - it's a nice house, just a very poor market so you need to do everything you can to make your house stand out!