To draw a manga girl in an embarrassed pose, think about her body language. She might hunch her shoulders, tuck in her chin, and have wide eyes. Also, add some sweat drops for effect.
You can start by having her stand with a slouched posture and a defiant look in her eyes. Maybe have one hand on her hip and the other holding something casually.
A cute, shy pose for a cartoon girl could involve her standing with knees slightly bent, fingers twisting together in front of her, and a small, bashful smile. You could also give her some cute accessories like a hair bow or a small bag to enhance the cuteness factor.
It could be that the punishment is too harsh for her and makes her embarrassed. Or she might think others will look down on her because of it.
It depends on the mood and action you want to convey. You could start with simple sketches to figure out the basic stance and then add details based on the character's personality and the scene.
You need to focus on the interaction and emotions between the girls. Make their body language natural and flowing.
You can start by imagining the girl's stance and the direction of her attack. Sketch out the basic outline of her body first.
Maybe she's shy or something happened that made her feel awkward.
You can start by imagining the character's personality and using that to guide the pose. Maybe he's slouching or standing with one hand in his pocket for a laid-back look.
A manga girl in a peace pose usually has a calm and serene look on her face. Her posture is upright but not stiff, and her fingers might be delicately positioned. The hairstyle and eye expression also contribute to the overall peaceful image.
It could be that in the manga world she's in, having that kind of strength isn't considered 'normal' and she's worried about being judged. Another reason might be that her strength has caused problems or misunderstandings with others.