Maybe it's part of the character's design to stand out or convey a certain mood.
It can add depth and relatability. A black tired face shows vulnerability and can make the character more human-like and interesting.
Maybe they've been shopping for hours and dealing with big crowds. That can be exhausting!
Maybe he's been swimming for a long time and hasn't had a break. That could make anyone tired.
Maybe she's had a long day at work or dealing with a lot of stress.
Maybe it's to highlight certain social issues or to create an emotional impact.
Well, when drawing a tired cartoon, think about the overall posture. Have the character leaning or sitting in a way that shows they have no energy. Also, use shading to give a sense of fatigue. Maybe add sweat drops for more emphasis.
First, draw the outline of the eyes smaller and a bit slanted. Add dark circles or shadows beneath to show tiredness. Also, make the eyelashes look a bit limp. It's all about creating that exhausted look.
Maybe it's because it shows a unique or relatable expression that catches people's eyes.
A character looking sexy and tired in a cartoon could be due to their posture. Leaning against something with a relaxed stance can give a sense of tiredness, while at the same time, showing a bit of skin or having a confident stance could make them seem sexy. The lighting and shading in the drawing can also play a role. Dark circles under the eyes for tiredness and strategic highlights on certain body parts for sexiness.
It could show a person with slumped shoulders and slow steps. Maybe they have a weary expression and their clothing is plain and simple in black and white.