From webcomics artists I admire Yuumei, especially her work "Fisheye Placebo":
The visual part is stunning.
From not-digital artists, I admire Anatoly Fomenko:
Actually, art is not his main occupation. His main occupation is math. And he's really super-good mathematician, author of fundamental classical works and textbooks - no joking... His pictures looks crazy, but actually, they all illustrate complicated geometrical and topology objects in a bizarre ways. (Fun fact: despite of his talents in math and art, guy is super bad historian. His "new chronology" isn't consistent with the scientific methodology of historical sciences. But anyway, who cares; he's a very interesting person and very interesting artist in any case.).
