I love it, it looks so interesting.
As pp have said 90% of books/pictures/magazines have to go into storage.
All windowsill clutter has to go, have a couple (at most) pot plants.
Kitchen bookcase should come out. Re-tile, it doesn't cost that much, box in whatever that pipe is coming out of your worktop. Clear out everything above the bookcase.
Living room, one rug, get rid of the other two, it looks like a trip hazard as they don't lie flat. Iron your tablecloth, I realise it may be part of the style but it just looks messy. The deer head has to go, it would put off a lot of people.
Bathroom I like it but many wouldn't. The doorframe is unfinished, people notice these little things. Clear away all your toiletries around the sink and bath and give it all a good clean, you can see the marks from the toothbrushes on the counter. All you should have out is soap/hand wash next to the sink. Get rid of the towels behind the door.
Both bedrooms look really nice and would look great without all the clutter and books.
I really like the hallway and it is the right place for art.
If I were you I would take it off the market, have a good clear out, fill all the picture holes and paint it so it is fresh and give everything a good clean.
Get the estate agent round to take more pictures. Get them to send them to you first and pick which ones you want.
I hope you have a dedicated Library in your new house. 
Good luck