In the first episode of Nekomonogatari (Black), we see this drawing of Araragi during his conversation with his sister at the beginning.
The text here states, according to the subtitles (and reading the text right to left):
IT'LL WEAKEN ME AS A HUMAN (COLOUR ART WORK)
I don't imagine the actual text here to be particularly significant though.
In either case, this reminded me a lot of Chinese socialist posters used for propaganda, but I am not sure if "interpretation" is correct, given that I haven't really been exposed to anything similar from any other East Asian countries (namely Japan, in this case). Is my interpretation correct, or can this drawing of Araragi also be interpreted as a reference to some non-Chinese drawing style (perhaps of the variety used for propaganda in another country)?