Olive's area of the dorm is fairly tidy, too. She has a couple of sketchbooks, with some partial, some complete sketches of fellow students (mostly fellow Gryffindors .. yes, even The Trio, though no more attention was paid to them than other Gryffindors. Actually, if one of the girls decides to flip through her sketchbooks and actually take note, they may notice that there's a bit more attention paid to the missing Dean Thomas than other Gryffindors) as well as some sketches of places around Hogwarts, Hogsmeade, and Diagon.