You need to stay in business so whilst lovely comfy armchairs would be great you need people to spend money.
A monthly "selection of books"
Beach reading
Mother/father day
Christmas
Ghost stories for Halloween
Include books for children as well parents/grandparents go nuts of good books for kids
How much do you need to make a week?
How much on a book?
How many units do you need to sell?
A good bookshop is great, but you say a small village, I would support a local independent bookshop but how much would that be realistically, me a book a month, eldest book a month, so two books a month from this household and we love books.
It needs to be a destination, with space for evening/weekend events. Perhaps toddler hour on a weekday that doesn't clash with other local events.
I don't think paint colour or armchairs are going to be the key to success here, a welcoming atmosphere, enthusiasm, and taking every opportunity you can to make money. A regular order/visit to care homes perhaps, maps local history for village visitors, selling Christian News (if your surrounding churches produce similar). Sell a board game of the month, host a DnD session once a week, think about a quiz night once a month with a winning voucher (entry £10 a team).
Honestly OP I hope you get an amazing shop and the community uses (or loses) it.