First, focus on understanding the style and lines used in the original comics. Then, break down the characters into simple components and build them up gradually. Pay attention to details like facial expressions and body postures.
Start by studying the basic shapes and proportions of the characters. Observe their unique features and expressions. Practice simple sketches to get familiar with their forms.
To draw Calvin and Hobbes comics well, you need to master the use of light and shadow to add depth. Also, study the backgrounds and settings to create a complete scene. Don't forget to keep practicing to improve your skills over time.