The drawing requirements are as follows:

1. Accurately express the overall image and proportion of the building, and highlight the key points and highlights of the building. In composition, attention should be paid to the relationship between the main facade, the auxiliary facade and the side facade of the building to avoid disharmony and imbalance.

2. Choose and use different materials correctly to enhance the layering and richness of buildings. When drawing the facade, it is necessary to accurately express the material and texture of buildings, such as brick walls, glass curtain walls and metal plates.

3. Choose the facade color reasonably to express the characteristics and style of the building, and at the same time, keep the color harmony and integrity. The function, cultural background and environmental atmosphere of the building should be considered.

4. Pay attention to details. When dealing with details, we need to pay attention to the fine expression of lines, decorations, windows, porches and other parts of the building. The detail treatment should conform to the overall style and theme of the building, and at the same time pay attention to the operability and durability of the details.