1. Determine the theme and style: Determine the theme and style of the future scientific and technological world you want to describe.
2. Collect materials and inspiration: Before painting, collect some materials and inspiration about the future world of science and technology.
3. Make a composition and color scheme: Make a composition and color scheme.
4. Draw sketches and details: You can start drawing sketches and details. Sketch refers to preliminary lines and shapes, while details refer to specific elements and features.
5. Coloring and retouching: Start coloring and retouching. Coloring refers to adding color to the picture, while retouching refers to adjusting the details and effects of the picture. You can choose the appropriate color according to the composition and color scheme, and increase the layering and three-dimensional sense of the picture by adjusting the brush strokes and color depth.