I thought a lot about how to effectively depict a character needing to use the restroom urgently. Perhaps the character would twist their whole body to hold in the urine. Since the human body is flexible, I twisted the upper and lower body accordingly. I drew the character's upper body, lower body, and head all facing different directions to make it look uncomfortable.
Since the lower body is the focus of the picture, I used anatomical knowledge related to the pelvis and legs to create a more realistic drawing. I placed Hipa-chan's hip area, the most important part, in the center of the picture and colored the other parts in a way that wouldn't draw attention.
A regrettable point is that if I had focused more on rendering the subject according to the initial light and shadow settings, I might have been able to create a picture with better three-dimensionality. I'll try to draw better next time.