Contouring and highlighting techniques can help enhance different face shapes by creating dimension, emphasizing certain features, and balancing proportions. Here are some general guidelines for contouring and highlighting various face shapes:

1. **Round Face**:
- Contour: Apply contour shades along the temples, under the cheekbones, and along the jawline to create more definition and elongate the face.
- Highlight: Apply highlighter on the center of the forehead, the tops of the cheekbones, and the center of the chin to add dimension and draw attention to the center of the face.

2. **Square Face**:
- Contour: Focus on softening the angles by applying contour shades along the hairline, under the cheekbones, and along the jawline, blending well to create a more rounded appearance.
- Highlight: Apply highlighter on the high points of the face, such as the tops of the cheekbones and the center of the forehead, to add subtle dimension and soften the overall look.

3. **Heart-shaped Face**:
- Contour: Apply contour shades along the temples and under the cheekbones, blending upwards towards the ears, to balance the width of the forehead and the narrowness of the chin.
- Highlight: Apply highlighter on the center of the forehead, the tops of the cheekbones, and the center of the chin to add brightness and draw attention away from the chin area.

4. **Oval Face**:
- Contour: Use contour shades sparingly to add subtle definition along the hairline, under the cheekbones, and along the jawline, focusing on enhancing natural features rather than drastically changing the face shape.
- Highlight: Apply highlighter on the high points of the face, such as the tops of the cheekbones and the center of the forehead, to enhance the natural contours and add luminosity to the skin.

5. **Diamond-shaped Face**:
- Contour: Apply contour shades along the temples and under the cheekbones, blending towards the center of the face, to soften the width of the cheekbones and balance the overall shape.
- Highlight: Apply highlighter on the center of the forehead, the tops of the cheekbones, and the center of the chin to add brightness and draw attention to the center of the face.

Remember to blend contour and highlight shades seamlessly for a natural-looking finish, and adjust the intensity based on personal preferences and desired makeup look. Additionally, choosing the right contour and highlight shades that complement your skin tone can help achieve the most flattering results.