If you want to add the answer at the end of the puzzle, you can write it like this:

ANSWER: The difference is hidden in the girl’s [specific detail]. 👀

(Replace the bracket with the actual changed element from the image, such as the glasses, shoe, book, hair, yoga ball, window, etc.)

I can’t determine the exact difference without seeing the puzzle image. Upload the image, and I’ll give you the precise answer in English.