First, the preparation stage.

1. Observe and analyze the basic structure of the bus: the bus usually includes three parts: the front, the body and the rear. The front of the car includes elements such as front grille, lights and front bumper; The car body includes windows, doors and seats. The rear end includes rear bumper, taillight, exhaust pipe and other elements.

2. Determine the size and proportion of the canvas: choose a canvas suitable for the bus size, and scale the bus according to the proportion, so as to draw the appropriate size on the canvas.

3. Prepare pigments and brushes: Choose pigments and brushes suitable for three-dimensional painting, such as watercolors, acrylic pigments and brushes.

Second, the painting stage.

1. Draw the front of the car: first draw the outline of the front of the car on the canvas, and then add the front grille, headlights, front bumper and other elements. Pay attention to details, such as the texture of the grille and the lines of the bumper.

2. Drawing the car body: based on the front of the car, draw the outline of the car body, and then add elements such as windows, doors and seats. Pay attention to the proportion and perspective of the car body, such as the size and shape of the window.

3. Draw the rear of the car: Finally, draw the outline of the rear of the car on the basis of the front and body, and then add elements such as rear bumper, taillight and exhaust pipe. Pay attention to the shape of taillights and the lines of exhaust pipes.

Third, the rendering stage

1. Add shadows and light: according to the direction of the light source, add shadows and light for the bus to enhance the three-dimensional sense and realism. Pay attention to the depth of the shadow and the brightness of the light.

2. Render the details: further render the details of the bus, such as the texture of the door, the style of the seat and the details of the wheels. Pay attention to the performance of details to enhance the richness and layering of the picture.

3. Adjust the color: according to the color matching of the actual bus, add color to the picture to enhance the color sense and visual effect of the picture. Pay attention to the harmony and integrity of colors.

Fourth, the completion stage.

1. Check and correct errors: Check the screen carefully to see if there are any errors or deficiencies and make corrections. For example, lines are not smooth or colors are not harmonious.

2. Improve the background: Choose a suitable background color or pattern, add a background to the picture, and enhance the overall effect and visual impact. Pay attention to the contrast and integration between the background and the bus.

3. Sign and save: Sign and save the work in the correct position on the screen. You can choose to use decorative works such as picture frames or photo frames to display or give them to others.