A heart-shaped face is characterized by a wider forehead and cheekbones, with a narrower chin. This unique shape can be beautifully accentuated with the right blush application techniques. Here's how to flatter your features if you have a heart-shaped face:

1. **Find Your Cheekbones:** The first step is to identify your cheekbones. You can do this by placing your fingers on the sides of your face, and when you feel the bone, that's your cheekbone.

2. **Apply Blush in a Diagonal Line:** For heart-shaped faces, the best way to apply blush is in a diagonal line. This helps to balance the wider forehead with the narrower chin. Start from the top of your cheekbone and sweep the blush towards your hairline.

3. **Blend Well:** Make sure to blend the blush well to avoid any harsh lines. This will give a natural and subtle look.

4. **Choose the Right Shade:** The shade of the blush also plays a crucial role in enhancing your features. For fair skin, opt for soft pinks or peaches. For medium skin, try rosy pinks or mauves. For darker skin tones, deep plums or bright tangerines work well.

5. **Highlight the Right Areas:** A little highlighter on the top of your cheekbones and the center of your forehead can also help to balance the features of a heart-shaped face.

Remember, the goal is to create a soft, natural look that enhances your heart-shaped face's unique features. Experiment with different shades and techniques until you find what works best for you.