Bonjour Raghad !
The difference is the same as between "tu" and "vous" : https://french.kwiziq.com/revision/grammar/tu-and-vous-are-used-for-three-types-of-you
In the context of this specific question, you were given the hint: "Use the 'tu' form", which meant only "tes yeux" was correct there.
I hope that's helpful!Bonne journée !
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