Its a beautiful house, in a beautiful location OP and I would be very interested in it, if I was actually in a position to drive down to view it.
However, I agree with many of the comments about the kitchen table, beds in the extension etc and am sure it would be worth you re-dressing the house and photographing again.
I personally dislike the extension and if I was buying the house would probably remove it, but again that is resolvable.
I suspect your issues are the parking problem and the fact that a lot of people out of area will be struggling to visit Devon to view it.
I would also be be questioning your agent. I have had experience of Humberts, albeit in Yorkshire not in Devon. I found they lacked proactivity and I became frustrated at their lack of follow through when people did view, or when, after the first month, my Rightmove viewing figures began to decline.
Given the price of your property and the fact that it could be attracting interest from out of area, I would be questioning why they haven’t added a video walk through on Rightmove. I would also be challenging why they haven’t discussed the photos with you and suggested areas where moving furniture etc might improve the marketing. If a group on MN can identify issues, why can’t they?
You are paying them a lot of money and they really need to earn it !!