There are a lot of great artists that have worked for DC over the years (even exclusively). I think this would be a great opportunity for folks to share some of their favorites. Feel free to posts images obviously since this relates to comic art.
Personally I think my favorite comic artist of all time (and this was tough) is Jose Luis Garcia Lopez. Strange, to me he's like one of the biggest names DC has ever had, yet a lot of people still don't know about him. If you've seen some part of licensed product for DC in a store, in someone's house, on the street, or on a car...chances are Jose Luis Garcia Lopez illustrated it. His style always seemed so flawless in a lot of ways to me. I'm training to be a comic penciler and hopefully one day I can work professionally for either of the big two. Jose Luis Garcia Lopez has probably been the number one inspiration for me the last few years. Maybe I can get a critique from him one day. Some of his work in the samples below: