There’s no rule you have to keep it all inside. Why not add one more layer of interest? Consider using the framing of the bookcases to suspend a dramatic mirror, framed artwork, or sentimental photographs. framed art on bookcase
Shiplap walls in bookcase, but change the shelving to match the wood within the pantry; consistent idea throughout. Bookcase on both sides of the brick mantle; no working fireplace though, just decorative.