There are certain Oz illustrations that I find iconic - John R. Neill's illustration for Ozma of Oz, of Ozma crossing the deadly desert with her army, is one of these. Unfortunately, the original artwork by Neill seems to have vanished into the mists of time, like so many other original Oz illustrations. I would love to have been able to see this piece!
I was fortunate several years ago to acquire Michael Herring's version of the same scene, painted for the cover of the DelRey paperback in 1978. This was closely based on the Neill illustration, with some minor changes. In this case the scene was considered memorable enough to represent the entire book!
I've just picked up another version, Skottie Young's drawing for the Marvel comic of Ozma of Oz. I've been enjoying the Marvel editions, scripted by Eric Shanower and drawn by Young. I'm not really a comic collector, and I haven't been picking up the individual comic books. Instead, I've been buying the hardcover compilations, so seeing the entire story in a fresh light is a pleasant surprise. In my view, Marvel has managed to do something that Reilly & Lee was always half-heartedly attempting - produce an updated version of the Oz books in a format to appeal to today's young readers!