I've recently been getting into the great artwork of Darwyn Cooke. Best known for the seminal Silver Age influenced 2004 mini-series The New Frontier, Cooke's retro cartoony style fit perfectly with the story of the Justice League's formation in the 1960's. I love the way he draws women and his sense of 60's style is simply wonderful. Here are a couple of more New Frontier covers that stand out to me.
Cooke also did a lot of other stuff for DC and other publishers. Check out some of these beauties courtesy of the Grand Comics Database. I especially like the JSA and T.H.U.N.D.E.R Agents covers.
I really hope I get to see him at a con soon. Over at the Comic Art Fans site, there are a bunch of beautiful con sketches he's done over the years. Darwyn Cooke, a true modern age artistic giant.