That's the best known photograph of Baudelaire, I think - and that stare makes me wonder how long he's had to hold the pose. How long an exposure would it have been?

I also realise now that I've been confusing Carjat with Nadar, who was a friend of Baudelaire and took this rather more relaxed photo of him. Also this one.

On the other hand, Carjat took the photo of Rimbaud.