Long-wear costume makeup starts with a design that suits the event, the weather, and your comfort. Sketch the main shapes before applying anything, and gather only the products needed for those features. Use products designed for their intended use and follow the label directions. Test unfamiliar makeup on a small area of skin in advance, especially if you have sensitive skin or have reacted to cosmetics before.
Clean, dry skin gives makeup a more predictable surface. Apply products in thin layers and allow each layer to settle before adding another. Large, simple shapes often read better in photos and are easier to repair than intricate patterns covering the entire face. Keep the eye area and your field of vision clear, and avoid applying products too close to areas where they may irritate you.
Bring a compact touch-up kit with the few items that matter most, such as a clean applicator, a tissue, and a small amount of the main color. Check your makeup during breaks rather than constantly layering on more product. At the end of the event, remove it gently according to product guidance and moisturize if appropriate. Stop using a product if irritation develops, and choose a simpler design next time if removal or wear proves uncomfortable.