Check out Seth Apter's MASTER CLASS post over at his blog, The Altered Page. This is most recent Master Class post - if you look in the sidebar you will find many more posts for this topic, among others.
Today, you will find my answer to the question posed:
'If you could take a class from one artist from anytime in history, including the present, who would it be and why?
As you will see, Dave McKean was the artist I chose. Discover his darkly mysterious world at your leisure.
And there are lots of other artist's responses to read. Seth has added links and pictures of his choosing to illustrate these. I think you will really enjoy reading the comments too... it's worth taking the extra time.