The layout messes with my head - especially the off centre chimney stack (fireplaces are usually a focal point, not off to a corner).
I feel like the front door is in the wrong place too - not because it’s at the side (I grew up in a 50s house with the door on the side) but because that bit of the front room where the dining table is is so oddly proportioned.
Have you had the entire downstairs layout reconfigured? Because it’s really messing with my head!
Re: the extension, bit weird but ok as a bonus space, the blind down at the end makes it look almost windowless though - yet this room has doors, right? They need to be in the photo. At the moment it’s just looks like a box. I would probably try and dress this as more of a garden room, wicker chairs, big pot plants, take a picture from the outside doors looking in. That way it makes sense as almost a summer house type thing, and it makes the way it connects to the house less strange.
Otherwise I would dress it properly as a bedroom and put the office stuff in the smallest bedroom.
At the moment, the photos actually do my head in a bit, because viewing it is like trying to work out a puzzle. A puzzling space isn’t a relaxing of pleasant place to live - maybe it makes a lot more sense in person and it’s just the pictures that are giving the wrong impression - if that’s the case then you definitely need to shift some furniture around and retake the photos so that they don’t leave you thinking ‘what room is that again’ and ‘where does that door lead to?’
Some of the other things that leave me feeling a bit discombobulated are the mismatched doors (white and period 50s upstairs, mixture of brown and white but both new downstairs) and the mixture of styles between clean, contemporary kitchen cupboards and farmhouse style stove. The extremely stylised bar stools really dominate the photo too, when the kitchen is actually a pretty lovely space, it’s just a bit incoherent. Same with the contrast between the dated wardrobes upstairs and the new kitchen downstairs - the whole house gives the feel of a half done project that got given up on?
I don’t expect you to ‘finish the project’ of course, you want to sell and get out, but I do think minimising the contrast between the done bits and the not-done bits and shifting the furniture around before retaking photos will help.