1. Determine the theme and scene: First, you need to determine the theme and scene you want to express. This can be a certain aspect of war, such as fighting, death, rescue, etc. Or a broader theme, such as the cruelty, courage and sacrifice of war. Choosing a theme and scene can better express your thoughts and feelings.

2. Sketch: Before you start drawing, you can draw a simple sketch. Sketch can help you better plan and compose music, and arrange people and actions. In sketch, you can try different layouts and angles until you find a satisfactory composition.

3. Draw the main characters: In the war picture, the characters are very important elements. Drawing the movements and expressions of the main characters can better show the cruelty and tension of the war. Pay attention to the reasonable proportion and movements of the characters, which makes people feel real and natural.

4. Add details and backgrounds: In addition to the main characters, you can also add some details and backgrounds, such as explosions, gunfire, smoke, etc., to enhance the atmosphere and feeling of war. These details and backgrounds can highlight the cruelty and destructive power of war and let the audience feel the atmosphere of war better.

5. Adjust the color and light: After you finish painting, you can adjust the color and light as needed. You can use different colors and shadow effects to highlight important elements and emphasize emotions. At the same time, pay attention to keep the color harmonious and natural, and avoid too dazzling or chaotic effects.

6. Improve the details: Finally, you need to carefully check and improve the details of the painting. This includes checking whether the proportions and movements of the characters are reasonable, whether the background and details are harmonious, and whether the colors and light are natural. Perfecting the details can make your painting more perfect and vivid.

The hazards of war are as follows:

1, casualties: the most direct harm of war is to cause casualties. In the war, thousands of people will lose their lives, be injured or be disabled. These casualties not only bring great pain to individuals and families, but also have a far-reaching impact on the whole society.

2. Economic losses: War will lead to huge economic losses. During the war, people can't work and live normally, and many infrastructures and properties will be damaged or destroyed. In addition, the war needs a lot of financial support, which will also have a negative impact on the national economy.

3. Social unrest: War often leads to social unrest and chaos. During the war, people's lives became unstable and many people were displaced and forced to leave their homes. This kind of chaos and instability will lead to various social problems, such as the spread of crime and disease.

4. Environmental damage: War will also cause serious damage to the environment. Many weapons and equipment will be used in the war, which will have a long-term negative impact on the environment, such as the pollution of land and water resources by chemical weapons and the disastrous impact of nuclear weapons on the environment.

5. Cultural loss: War often leads to cultural loss. Many cultural heritages and historical sites will be destroyed or lost in the war. This will not only cause losses to individuals and families, but also have a negative impact on the cultural heritage of the whole country and nation.