Like how Supreme written by Alan Moore was a Homage to Superman, Glory became Alan Moore's homage to Wonder Woman.
Alan Moore is an acclaimed writer because he understands the medium he writes in. When he writes comics for example, he tires to write comics that can't be filmed, since comics are their own art form and film is its own art form. Page 2 is an example of Moore's ability to conceive a visual where the panels tell so much and are more a platform for information then pictures for a storyboard. The magic Alan Moore believes in is constantly present in the comics he writes, for the magic he believes in is imagination in how unlimited the mind can create things.
Issue Zero is more a set up issue. It is an issue to wrap up the older direction of Glory and set up what Alan Moore wanted to do with the series. This comic would contain 8 pages of story content by Alan Moore. This comic would take what was printed in Glory #0 from Awesome comics and condense it to 8 pages from 10. Moore and artist Brandon Peterson construct a magical setting that would be the kingdom from where Glory came from, like Paradise Island to Wonder Woman. The real world, for how little we see it has more shades in the pages, while the Great Garden is lush with color.
The trade off from the Awesome comic to the Avatar printing is that the Avatar printing looses the character design pages, but gets Glory's history told over 13 pages and is illustrated by many great comic arts, such as Joseph Michael Linsner. Robert Lugibihl would be the actual writer for the text of the 13 extra pages, but Alan Moore and Mary Jo Duffy would contribute the to the direction of what would be used in this Glory history wrap up.
Without knowledge of occult and magic, there are many symbols in this comic that the reader will miss. The most important symbol would be the Möbius strip (Ouroboros) that is the very final panel in the story.
The Awesome comics printing of Glory #0 is a great comic, but I would honestly suggest looking for the Avatar printing instead, because it has more story content.