I would not hesitate to go back and take more photos until you get the perfect shot. Then I would have the mom sign off on that one ideal photo of the daughter's face before you do any more work on it.
If the project hinges on having the daughter laughing at her brother, that's going to take a lot of photography (or terrific luck) to get just the right shot. I would never attempt to combine two or more face reference photos -- too much is different and has to be guessed at.
Perhaps this is the reason for your past difficulty with likenesses. I choose ONE face shot to work from and that's it.
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