When drawing a face in 3D, consider these five important aspects:

1. Proportions: Understand the basic proportions of the face, such as the distance between the eyes (one eye width apart) and the placement of features like the nose and mouth relative to the eyes and chin.

2. Planes and Angles: Visualize the face as a series of planes. Use perspective to define how features relate to each other in three-dimensional space, considering how light and shadow affect form.

3. Construction Lines: Start with simple geometric shapes (like a block or box) to establish the head’s structure before adding details. This helps maintain correct proportions and angles.

4. Curvature: Incorporate curves to represent the organic nature of facial features, ensuring smooth transitions between planes, especially around the jawline and forehead.

5. Details and Textures: Once the basic structure is established, add details like wrinkles, skin texture, and hair, which contribute to a realistic appearance while maintaining the overall 3D form.