1. First, look for reference pictures about this character or weapon, which can be game screenshots, animated pictures or other artworks.

2. Secondly, according to the reference picture, draw the outline of the figure or weapon on the drawing paper with a pencil or a thin black pen. You can outline the general shape with simple lines first, and then gradually refine the details.

3. Then fill in the details of the character or weapon according to the reference picture, including clothing, expression, texture of the weapon, etc. You can fill in the details with colored pens, watercolors and oil paints.

4. Then adding shadows and light and shadow can make the picture more vivid. According to the direction of the light source, different colors are used to represent the shadows and light shadows of people or weapons.

5. Finally, after the overall picture is completed, the details can be adjusted to make the picture more perfect.