drawn at today's class, coz the teach gave a last 2 hour of chances to the students who haven't finish their HW, while giving free time for those who have done theirs.
since I've finish mine beforehand :D & was bored during those free time, I randomly stroke Euler's face with the fude-pen, & well... here he is ;D

naming title shamelessly taken from this year's [Bleach the movie: Fade To Black] which will premier this Dec ;) besides, it sort of suits for both this pic & Takasugi himself (ie: the 'blind manmath' Leonhard Euler); I think.... |D

drawn/ink/shade directly with fude-pen only; also done in less than an hour; so don't mind the messiness