It could be a gesture of kindness or maybe he owes her money. There are various possible reasons depending on the context of the cartoon.
Perhaps the woman did something for him and this is his way of showing appreciation. Or it might just be a part of a funny or random story plot.
Maybe he's trying to help her out of a financial crisis or it could be a form of payment for something she did for him.
Maybe he's feeling generous and wants to help others.
Maybe he likes her and wants to show his affection.
Maybe it's a gesture of love or a special occasion. Could be just a random act to make her happy.
It could be that he's trying to show a rebellious attitude or is responding to a perceived injustice. But it's not a very nice gesture.
The cartoon woman might be giving a thumbs up because she accomplished a task, got good news, or is just in a positive mood. Sometimes, it's just a random gesture to convey a general sense of optimism.
Maybe she's not happy with something in the cartoon, like a plot point or a character's action.
Maybe they are friends and one is sharing to be nice.
The cartoon man could be giving a thumbs up because he's happy with the outcome of a situation. Or perhaps he's just trying to be encouraging to someone.
Maybe he spent all his money carelessly or had some bad luck and lost it.