1. Prepare materials: First, prepare the painting tools and materials you need. You can choose different painting tools such as pencil, crayons, crayons, watercolors and oil paintings, and choose the right tool according to your own preferences and proficiency.

2. conceive the route: before you start painting, imagine the route that the red head travels in the cow's stomach. It can be a winding path, a winding river or a steep mountain road leading to the top of the mountain. Imagine the red journey and destination, as well as the scenic spots and challenges along the way, and write them on paper.

3. Draw the background: Next, draw the shape of a cow on the paper with a pencil or colored pencil. You can draw the body, legs and head of a cow and see your imagination and theme. You can use different colors and textures to make cows look more real and interesting.

4. Add details: After the shape of the cow is drawn, you can start to add some details. You can draw eyes, nose, mouth and so on. Make the cow's expression more vivid and personalized. You can draw details such as spots and hair of cows, making them look more real and three-dimensional.

5. Draw the route: In the cow, draw the route that the red head travels in the cow's belly. Different lines and colors can be used to mark the travel route of the red head. You can draw scenic spots, mountains, lakes and so on. The red head passes through, depending on your imagination and theme.

6. Add details and decorations: After the circuit diagram is drawn, you can continue to add some details and decorations to make your painting more interesting. You can draw some small animals, plants, clouds and so on to make your painting more vivid and three-dimensional.

7. Coloring and finishing: Finally, you can use colored pencils, watercolors or other painting tools to color and finish your paintings. You can choose bright colors or soft tones, depending on your theme and atmosphere. You can use different techniques, such as gradient, painting and brush, to make your painting more vivid and layered.

The story of the red head traveling in the belly of a cow;

In this story, the travel route of the red head in the cow's belly runs through the whole text. The red head was caught in the mouth by Daniel, entered the cow's stomach, went from the first stomach to the second stomach, returned to the cow's mouth, and finally sprayed out with the grass. This travel route contains the scientific knowledge of cow rumination.

In the story, Qingtou's idea to Hongtou is to let Hongtou hide first, and then return the swallowed grass to his mouth when the cow is resting, and then chew it slowly. This method makes use of the habit of cattle grazing, so that the red head can escape in the crisis.

The whole story is full of childlike interest and imagination, and through interesting fairy tales, it conveys the scientific knowledge about rumination to readers. At the same time, the friendship between Qingtou and Hongtou in the story is also touching.