Kevin Nowlan was a very good batman artist in the 90s too. Liked his style a lot.
Denys Cowan is my pick for most unheralded (Batman) artist of all time.
I never really thought of Cowan as a Batman artist. As I recall, he only drew a handful of Batman stories here and there and Batman whenever he guest starred while he was illustrating The Question. Which issues of his that he drew stand out to you? I will have to seek them out, as I enjoy his art.