Ah, I finally found out why it didn't work! 😆
That's because I tried with Clover and there is no option to remove Clover's bra!😲
I can remove only Sam & Alex's bras and only if they are wearing outfit 2.
Well, I can remove Sam's bra if she wears outfit 3 too however it doesn't work for the picture, the picture requires outfit 2.
Anyway, thank you for telling me that I could remove Sam & Alex's bra by clicking on it, I wasn't aware of that and I finally completed the pictures quest...or that's what I thought... 😉