Divide the shape into 4 parts with a cross guideline. Divide the top half with a horizontal guideline. Divide the top quarter with another horizontal line.   To draw the right arm, draw it with a soft curve going upwards ending between the top edge of the rectangle and the 1st horizontal  guideline. Draw a U for the left arm. Thicken Domo's body outline. The mouth is drawn with soft corners and tilted a bit to the right. Draw Domo's teeth with jagged lines. Add highlights to his eyes.

TL;DR in Chinese:
画一个矩形。 画一个平滑柔软的、不规则的W形作为多摩君的身体。 在W形身体的顶部画一条柔软的曲线将其闭合。 画出多摩君的胳膊。 擦掉重叠的辅助线。 根据辅助线画出多摩君的眼睛和嘴巴。 擦掉所有不必要的辅助线。 上色。