The girl pasted over Tintin is Wednesday Addams, and she mistakenly refers to Captain Haddock as a commodore, so instead of Tintin saying "Captain, it's Wednesday," Haddock says "Wednesday, it's Captain."
The recaptioned panel gained significant popularity as a reaction image used to express tiredness and being overwhelmed, but is also used as a template for redraws.
The joke is it inverts the usual "what a week/but captain it's Wednesday" meme. Wednesday (the character) calls the captain Commodore (a title for someone in command of a group of ships, but lower rank than an admiral). The captain corrects Wednesday, saying he's just a captain.
In the original instance of this meme (no idea if it's like that in the comic as well) the captain says exhaustedly "What a week." And Tintin says "Captain, it's Wednesday!"