I just... can't seem to draw Trilby at all. None of these look right.
The one at the bottom reading is Trilby at twenty or so, trying to study and not at all used to the whole nocturnal thing yet.
(There's a couple of Barnaby Keele sketches on the page as well -- two in the upper right corner, one in the lower left.)
Trilby is a creation of Ben "Yahtzee" Croshaw, from the Chzo Mythos adventure games.