Explore the vivid imagery in Chapter Two of 'The Great Gatsby' by F. Scott Fitzgerald. In a concise essay of approximately 250 words, analyze how Fitzgerald uses descriptive language to portray the setting, characters, and atmosphere. Consider the contrast between the lifestyles depicted in chapter one versus the desolation of the 'valley of ashes'. How does this imagery contribute to the themes and mood of the novel? Provide specific examples from the text to support your analysis.