When evaluating perfume quality, the most critical factor is the Fragrance Concentration. You should distinguish between Parfum (20-30% concentration), Eau de Parfum (15-20%), and Eau de Toilette (5-15%) based on your target market's longevity requirements. Additionally, verify the Scent Pyramid (Top, Middle, and Base notes) to ensure a complex and evolving olfactory experience. Ensure the Alcohol Grade used is high-purity Denatured Alcohol (SD Alcohol) to prevent skin irritation and maintain scent integrity.