To achieve a flawless complexion without makeup, start by maintaining a consistent skincare routine that includes cleansing, exfoliating, and moisturizing. Protect your skin from the sun with a broad-spectrum sunscreen, and stay hydrated by drinking plenty of water. Eating a balanced diet rich in fruits, vegetables, and healthy fats can also help improve skin health. Getting enough rest and managing stress can also contribute to a healthy, glowing complexion.