You get a sense of Lucas' work from the initial scene in ANH. The Cantina scene is a perfect example. Each alien looks specifically chosen, and all the "background" characters appear to be interacting with each other to create the mood and feel of a seedy intergalactic bar.
Contrast that with say this scene:
Too much going on. In every direction you look there's Star Warsy aliens all engaged in something exciting all going on at once. That's not how bars actually are.
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