I'm aware of two blogs dedicated to the theme of books in art:
Unfortunately, there have been no new posts on these blogs for months, and for all I know they may be defunct. I have my own digital collection of paintings featuring books and readers (many culled from those two blogs), and I'll post some of them here when I can't think of anything else to blog about, which happens increasingly often these days.
Alexandre Antigna (1817-1878), La fille du bouquiniste (1855), in the Musée des Beaux-Arts, La Rochelle:
