These are the 3 most common mistakes I see — and they’re easier to fix than you think. 1. Matching the wrong area — always match foundation to your neck, never just your face 2. Skipping primer — primer is what keeps your makeup locked in place all day, especially in Miami heat 3. Applying too many layers — build it thin and blend well rather than piling it on When foundation is done right, it disappears into your skin and looks exactly like this.