绘制卡通鸭子的四步指南

创建一个四格正方形布局指南，用于绘制一只简单的卡通鸭子。

1. 第一格显示一个灰色的椭圆形作为鸭子的身体。
2. 第二格显示一个灰色的较小圆形，与椭圆形的前部重叠，作为头部。
3. 在第三格中，头部添加了灰色的喙，身体底部连接了蹼足。
4. 最后一格展示了完成的鸭子，现在有了颜色，头部有两只眼睛，身体上有一个翅膀轮廓。

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**Original English:**
Create a four-panel, square layout guide for drawing a simple cartoon duck.

1. Panel one displays a grayscale oval for the duck's body.
2. Panel two shows a grayscale smaller circle overlapping the front of the oval for the head.
3. In panel three, a grayscale beak is added to the head, and webbed feet are attached to the bottom of the body.
4. The final panel reveals the completed  duck with color now with two eyes on the head, and a wing outline on the body.