I have a new favorite artist of the moment. Stanley Borack. He passed away in 1993, so he's obviously not a new artist, but his work is fantastic. He served in the Navy during WW2 and when he got back went to art school to study painting. Out of school he started painting book and magazine covers, which is what he ended up doing for the remainder of his career. In my opinion, the strongest work came out of his pulp phase in the late 50s where he was doing covers for mystery novels about Nazis, cowboys and Amazon women. I love his use of negative space since he always new the title and author information would have to be laid into the composition.
Check it out here.