Off the top of my head? Patrick Woodroffe? And, in a special way, H.R. Giger and Jean Giraud?
I grew up mostly on the Franco-Belgian bandes dessinées and always had a thing for la ligne claire1) myself, but when Elfquest came along I was really enthralled.
1) Which, when it emerged, had a lot to do with the printing technology available at that time.
