Bloodshot eyes in cartoons might be a way to show that the character is sick or has overexerted themselves. It's a visual cue for the audience to understand the character's condition without needing a lot of explanation.
Maybe it's to show that the character is tired or stressed. Like when we humans get that way, our eyes can look bloodshot.
Sometimes, bloodshot eyes in cartoons are used to indicate that the character is sick or has been overworking. It's a visual cue to tell the audience something's not right with them.
Cartoon characters having bloodshot eyes might be for comedic effect. It can make them look funny and exaggerated. Or it could imply they're not feeling well or have been through some kind of physical or mental strain.
It could be due to the character being tired or having stayed up late. Maybe they've been through some intense emotions or stress.
In zombie cartoons, bloodshot eyes often indicate the zombie's aggression or state of frenzy.
Maybe it's been up too late or had a scary encounter.
Perhaps Doug has an eye infection or allergy that led to his bloodshot eyes. Or it might just be a part of the cartoon's artistic style to make him look a certain way.
It might be to show they're tired or sick. Maybe they've been through a lot and it's a visual cue for that.
It could be for a unique artistic style or to give a mysterious or abstract look.
Maybe they're scared or in pain. Sometimes in cartoons, these expressions show intense emotions.