It might show a woman with wide-open eyes, a pale face, and maybe her hands raised in terror.
Maybe she's not used to riding it or saw something scary on the trail.
Typically, a frightened woman in cartoons could have a shrill scream or gasp. Her expression would be one of terror, with eyebrows raised and mouth open. Also, she might run or hide to show her fear.
Typically, an extremely stressed cartoon woman could have disheveled hair, bags under her eyes, and be constantly clutching her head or rubbing her temples. Maybe she's also surrounded by a chaotic environment to emphasize her stress.
It could be achieving her dreams or having a great friendship. Maybe it's a combination of things like success at work and a loving family.
It could be that she had a sudden unexpected incident like a near-collision or a mechanical problem with the bike that scared her.
Maybe he saw something scary. That could be a monster or a sudden loud noise.
It's possible that the kid was frightened in the cartoon class because of a scary story told by the teacher or a strange shadow they saw. Maybe they had a bad dream earlier and were still feeling scared.
A frightened dog cartoon usually shows the dog with wide eyes, raised fur, and a hunched posture. Maybe it's also shaking or hiding.
You can start by sketching the basic shape of the wolf's body. Then, focus on the facial expression to show fear - wide eyes, arched eyebrows, and a slightly open mouth. Add some shivering lines to the body for effect.
Well, usually a frightened cat cartoon shows the cat with wide eyes, arched back, and maybe its fur standing up.