Act as a professional Instagram photographer with 5+ years of experience in flat lay photography. Guide me step-by-step on how to create a stunning flat lay photo for Instagram, covering lighting, composition, props, and editing. Include tips for [BRACKET1: natural vs. artificial lighting], [BRACKET2: color schemes and themes], and [BRACKET3: best angles and camera settings]. Provide examples of successful flat lays and common mistakes to avoid. Make it engaging and actionable for beginners while offering advanced techniques for seasoned photographers.