To decorate a snowman, you'll need to gather various materials such as coal, sticks, and colorful decorations like ribbons, buttons, and scarves. Start by shaping three balls of snow in different sizes and stack them on top of each other, with the largest on the bottom and the smallest on the top. Then, use the coal to create eyes, a nose, and a mouth. Use the sticks to create arms and decorate the snowman with the colorful decorations. Have fun and be creative!