Fear is a stressful experience that occurs when people are powerless to get rid of a dangerous situation. It is often accompanied by a series of physiological changes, such as increased heart rate, irregular heartbeat, and groggy body. But there is a specific area of the brain that becomes active after fear to produce courage. There are different and weird types of fears, such as Ombrophobia(fear of rain) and bathmophobia(fear of deep water), social phobia. Some people are afraid of ghosts, some people are afraid of snakes, everyone's fear is different.
The concept of this illustration is "tremble". I used different circles to represent the various kinds of phobia. Malicious words and horrendous gaze can also produce fear, so I included mouths and eyes growing from the ground at the bottom.