I read Robert Henri's "The Art Spirit" in the last year, liked it quite a bit.
I haven't been that fond of his portraits, I guess I like them OK, but the subjects look to me as if they'd fallen into a rouge pot. OTOH, the landscapes, which I'm seeing for the first time on this thread, are wonderful.
You're ahead of me; I've only read segments of "The Art Spirit." And I agree about the portraits; that's a great comment about the rouge pot. Those portraits are just way too dark for my taste.