To create effective facial expression, try to face the mirror and personally emote it. Here are some illustrations to guide you.
Facial expressions are not enough, usually they are helped by the stretching of the body muscles and involuntary reflex. Of course we can't expect a whole body drawing all the time. For pure facial expression, observe how the eyeballs, lips and brows play important role in creating the difference. It affects a lot... If the artist is too happy, it is simply hard to draw sad images.
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