Blue Period Manga Vol 1 by Tsubasa Yamaguchi

Yatora is the perfect high school student, with good grades and lots of friends. It’s an effortless performance, and, ultimately… a dull one. But he wanders into the art room one day, and a lone painting captures his eye, awakening him to a kind of beauty he never knew. Compelled and consumed, he dives in headfirst — and he’s about to learn how savage and unforgiving art can be!